should this hero team work ? possible improvements

It seems in theory this build should work, but you said yourself it does not. That being said here are some ideas:
1) You have 2 copies of rejuvination and recovery on your 2 resto healers. Spirits dont stack, so if you plan on keeping resto healers, get rid of the copy.
2) I'm really not sure how you are dying considering that for a 6 man zone you actually have a whole lot of healing and protting! I dont even use that much for 8 man zones (I usually just take 1 monk and an ST rit). You have 2 resto healers and a prot halfbar, but you said your heros can seem to stay alive. This should never happen. Personally im not a fan of /rt healers, so i would just change to a monk. You should only need to take a monk healer, with the prot halfbar on the order necro to stay alive in a 6 man zone.
3) The 2 dervish builds seem fine, however melee hero AI is terrible, which could be a source of problems.

Hopefully this helps! Also what you said was your standard 5 man team seems better. Having mesmers + MM + spirits will typically roll through anything.

The overlapping spirits was a legacy from when i tried HB as the main healer, Ill probably try hb again just to make sure, he had energy issues the last time.

I amended the barbs resto by putting life and spirit transfer then set out looking for an area which i had already VQed and considered to be average and doesnt require special measures to tackle, i eventually chose the sage lands, went for a little stroll, went ok for a while then i got into a clump of trees and was fighting some spiders, breezed through them, was just finishing the last one or two when i looked behind and saw that 3 marrow spider things had popped up and some how killed olias !

Those things can do like 70 health steal each thats ... 210 in about a second, olias max health is 490 and he had no dp at the time, i suppose its possible that the spirits were all dead for some reason, meaning spirit transfer would not be usable to counter the spike, but still mend body and soul should be able to do it especially if olias is kiting after the first hp loss.

its this sort of thing which makes me think hang on should we really have taken a death there ( sometimes on my normal team i could pull way too much and stay clean ) .

*Why A/R? A standard WotA or MS build would produce more damage and is probably a bit tougher due to critical agility.
*Avatar of Balthazar changes the damage type to holy. All physical buffs like Barbs, MoP, OotV, and possibly any others I missed will have no effect on the AoB derv.

Thats an excellent point about the balthazar avatar, i dont know that much about dervish i just choose it becuase it looks cool. im going to run into the same issue with the staggering force / dust cloak etc. The A/R is becuase ive not tried it before and i also though it would be good to have the pet also hitting to trigger barbs and i could also use other buffs onto the pet like soh, its true that it has little defensive or utility options compared to the more common builds, at the same time i could put unstoppable instead of YMLAD for more reslience, im wondering if the issue is something to do with having 3 'tanks' with not much defensive abilities, and the prot being spread out too thinly, but i also wonder if its the nature of the backline which is the issue ( you could have 3 sf sins but if the healer takes all the aggro it wouldnt matter ).

change your own char to this and there should be no problem in any part of the game.
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There are a few issues with that build.

1. From what I have seen, heroes don't use Pious Renewal well. The best avatar based build for heroes that I know of, tend to be those based around Dwayna for the healing.

2. Melee AI is limited as you already know.

3. Your team build in your first post has 2 Recovery. It is not a good idea to bring 2 copies of the same spirit as one would override and replace the other but I think you fixed that in your later build.

4. Not a good idea to make your orders guy as the prot guy. Orders last for 5s, so if you want your orders to be refreshed frequently, you want to equip the rest of his bar with skills that either have long recharges or would not need him to cast often. Prots are important in HM and you want your hero to be free to activate them at the moment when they are needed, not competing for cast time with orders, unless you want to micro them yourself. Yes, I am referring to PS.

5. SoA is more useful than Shielding hands for supporting melee.

6. You have no splinter weapon to support your melee.

7. I suggest you replace your SoS N/Rt with a primary rit hero to get level 14 channeling and move his necro skills to another necro.

8. You have no Strength of Honor, which is a great skill to support your melee.

9. Not worth bringing painful bond with only 4 spirits in the team.

You could always make one dervish into a Dwaynas support, to compensate you could drop the second necro healer thus freeing up a slot for utility. A Channeling rit with either Smiting prayers or Curses secondary would probably be a good choice IMO.

Glad it seems to be working out for you.

I typically use SoH and splinter, wanted to do it different this time, I feel that the orders / barbs makes up for lack of soh,
plus I usually just have 1 physical, but for here there are 4 ( although the pet doesnt benefit from everything ).
Im using sand shards and mark of pain to replace splinter really, splinter could certainly swap for painful bond but it might be wasting energy if the ai uses it badly, as in 6 man and with heros on frontline its less likely that the splinter will deliver its payload fully, also i like painful bond a lot because it effectively doubles the spirits damage and has a good duration and affects multiple targets so it should be in effect most of the time.

I usually value soa but i was trying not to put too many 1 second + spells on that bar,
also i think *if* the aggro is spread out more then soa wont have its normal efficiency.

I tried acting on Point 4 by putting the prot on the SoS and putting the barbs / mop / rip onto the orders, didn't work because
1) only 1 healer remaining 2) taking too long to put up all the hexes and orders, making the spikes slower.

Point 7 is good advice, I managed to switch things around so that the main healer has barbs and mop, changed the SoS into a primary, same heals and the skill remove hex, I first thought it would reduce the healing ( putting things onto the main healer ) but it doesnt because the SoS healer is now more free ( less casting time burden ) and also has more sensible attributes, the main healer just loses some soul reaping, he had 'too much' anyway,
The team should actually be even stronger now

Ah ok i see, I haven't payed much attention to spirit targetting and painful, I know spirits like to shoot in different directions sometime though, though i don't know what causes that and the rules by which they decide their targets, or whether it takes into account the presence of that hex on a possible target, also i suppose it would depend on the heroes targetting behaviour compared to the spirits. If your right and they are very bad at coinciding then it makes sense that you would possibly only want to use it alongside an sogm rit for example, when i picked the skill it was based on them hitting a hexed target everytime and thus and additonal 80 or so damage per attack cycle, but if they arn't accurate that assumption isnt valid and it may provide half that damage, splinter i know can do thousands of damage in one application in the right situation even in 6 man.

I started looking into the dual avatar supported by SoH, ive noticed that the dervish skill usage AI is terrible, really really bad, they can't tell the difference between a dervish and a monk enchantment, meaning they will use skills like Twin moon sweep without a dervish enchantment, they also seem to have no information about what skills should be used as a teardown and which are very strong long duration defense skills, and thus will waste them and leave long duration teardowns such as aura of thorns intact.

Pious Fury they will use without having any enchantments at all, the same applies to Pious assault. Using fleeting stability on a stationary target as a teardown, they also sometimes use these teardown attacks with no dervish enchantment, when a perfectly useful flash enchant is recharged, the list goes on and on, the question is can I make two builds which provide good damage and conditions without much overlap, which avoid all of these pitfalls ?

Im noticing that a LOT of strategies are viable in theory but they fall down when you try and put them into a form that heroes can handle, and thus how many interesting things you could do if you had a coordinated team of players.