My first try at LS was a Canthan necro who I managed to hide behind a wall of minions most of the time. She died in Naphui Quarter in a PUG (which I entered because I got impatient and didn't wait for guild members) at 263K. I then took her and made her a legendary cartographer. This helped immensely with my next try as I had seen and done everything.
Second try was an Elonan ranger. She made it to Legendary Survivor without doing many of the tricks you have seen above. Couldn't do some of them, Hard Mode didn't exist until she was at around 800K XP. Ran her through all Elonan missions up to and including Gate of Pain (but not Jennur's Horde or Dzaghunor Bastion), Canthan missions through Sunjiang District, and Tyrian missions between Seaboard and Sanctum Cay. I did want to see how many sunspear protion points I could get (pre-HM) so I cleared Arkjok Ward 3 or 4 times under bounties. Did some LB point farming outside Bastion and got up to lvl 3. Did every Canthan quest I could lay my hands on (kept Seek Out Brother Tosai and Drunken Master incomplete as long as possible though). Capped around 50 elites as well but didn't make an elite push until I was at about 1.2M XP.
Found out a lot of things (many of which are mentioned above):
1. If you are like me, F12 (or Alt-F4, or mapping to the guild hall) might be your friend but you might feel your title is cheapened. I only mapped out once. Wasn't in danger in the mission (Selbelkah) but was halfway through the fight and I realized I had not reallocated my attribute points correctly when I changed my build and was with heroes and henchmen so I wasn't affecting anyone else. And, since I did get Legendary Survivor without mapping out, I really dislike people who claim that the only thing the title shows is the ability to press F12 followed by Y.
2. Do not, and I repeat, do not play with PUGS.
3. When playing with guild/alliance groups, point out that you are going for survivor. When I did that, I would go into missions and quests feeling like I had a bodyguard.
4. Plan on playing with heros and henchmen a lot. Get used to directing them. Use Ctrl-Shift-Space to send them in first. Flag them into spots where you know enemies will trigger. They are seven additional weapons to use if you use them correctly.
5. If you can, choose a monk secondary, carry protective spirit and a live rebirth. Keep protective spirit up any time possible -- don't count on the monks to do it for you. If you can't choose or don't want a monk secondary, make sure you always have some kind of self-heal on you.
6. Equip your armor with Survivor runes and best best Vigor rune you can buy. Have a +30 HP weapon mod. Do not use any major or superior runes. Goal here is to have the highest health possible (obviously) because the AI will attack lower armor/lower health first.
7. Always make sure you have a retreat path. Often, getting sandwiched between two groups will mean serious trouble if not death.
8. If you are unfamiliar with a mission or an area, take another character through it first if at all possible. Find out what happens first with a similar setup to what you will encounter with a survivor.
9. Solo farming is generally a bad idea -- good for XP farming but a bad idea for a survivor. There are no 100% foolproof solo farming builds (that I am aware of or perhaps I don't have enough practice with them) and all it takes is one slip up to end your run.
10. Finally, spend money on your survivor, don't try and cheap out on armor, runes, or weapons. Always have the highest armor level you can buy. Keep buying insignias and runes to boost your health. Have the best weapon you can get -- honestly fortitude mods are better than armor mods if for no other reason so you can survive damage spikes and still run away.
Now I am working on an assassin. She's still a survivor at 165K and rolling through Tyria (when I feel like playing her

). With luck I'll eventually have another legendary soon.