Any suggestions for these builds?

Grenth's Reaper(PvE/PvP)
12 - Curses
12 - Soul Reaping
[skill]Parasitic Bond[/skill][skill]Faintheartedness[/skill][skill]Insidious Parasite[/skill][skill]Desecrate Enchantments[/skill][skill]Well of Weariness[/skill][skill]Reaper's Mark[/skill][skill]Signet of Lost Souls[/skill][skill]Resurrection Signet[/skill] Now the whole point of [skill=text]Reaper's Mark[/skill] is to kill the foe before using up the 12 + (13-5)= 20 energy you get from it's death. Using [skill=text]Faintheartedness[/skill] and [skill=text]Insidious Parasite[/skill] together is not a good way to do that, the main use of the mark is to use it in a build with a quickenergyheavysingletargetbloodspike.
Not with [skill=text]Well of Weariness[/skill], what is that supposed to do anyway? all PvE mobs have like 50 energy and in PvP people will just not step in it because unlike mobs (some of the ) people have brains.

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All in all, the builds get a failing grade.
The Dead Weight(Scales of Grenth) build might have use somewhere, I'd mess with it a little, it should be useful in places foes get tunneled like "In defense of the eye" in which case bringing [skill=text]Putrid Explosion[/skill] is a good idea.

You are trying to play the necro as an elementalist or illusion mesmer or something, Your builds have a clear split between spike skills and defense skills, for a good blood spike your healing is at least 50% of your damage.

For a curser the key word is crowd control, using fire and forget skills they go:Select a foe... Cast hex 1... Cast hex 2... Cast cover hex... Select the next foe... Repeat Doing it right will make the foes die all by themselves, degen only helps foes with this, you need to use hexes that deal additional damage when X. because 10 degen will not be enough damage to kill lvl 20+ foes in a acceptable amount of time
Aside from the obvious, that includes [skill=text]Soul Barbs[/skill], [skill=text]Mark of Pain[/skill] and [skill=text]Price of Failure[/skill] and plenty others, not only SS.
Also cursers have some of the faster more spiky AoE, it is what takes care of the foes that survive the fire and forget chain; though it is still not viable to make a necro build with only direct damage ranged AoE.(point blank works well though, or used too; haven't seen any1 using it for quite a while)

A death spike(no MM build so I guess you don't want to, better to check the sticky if you need a MM anyways) has pretty much devolved into the new ranged AoE necro, using [skill=text]Rising Bile[/skill] [wiki]Putrid Bile[/wiki] and [skill=text]Putrid Explosion[/skill] they deal area damage quickly when a foe dies, in PvE where mobs are grouped together well that is pretty useful.
Because all those skills are single shot they will not scatter foes like [skill=text]Mark of Pain[/skill] does, so other AoE effects work well with them too.
The basic elite for a Death magic spike uses [skill=text]Icy Veins[/skill] for a elite, [skill=text]Discord[/skill] is nice too if you can't use [wiki]Necrosis[/wiki] as you are precasting hexes before starting a spike anyway, the time needed to fulfill Discord's requirements won't be that bad.

I hope I said something even remotely useful.