organization is the key of the game for endgame
You organize the build before doing it, otherwise you suck.
Ofc to do that you need knowledge of the game, and yours is a good starting point, but is also needed a knowledge of the raid.
For example for baba you need 2 tanks, for other raid 2 tanks might be useful but not mandatory.
you want a A-star team?
there you go
2 fvs healer beacon
1 bard buffer
1 tank
(1 caster cc, can't recall a endgame raid where is needed tho, fvs frog is far enough)
rest dps, melee better than ranged, but of course the more different builds the more sinergy
(20 ranger, uba druid, 20 rogue, etc)
but build is not everything, you need gear, so you need to organize and farm it!
organization is the key

most people are lazy and plays this game like a shooter game. it's true you need skills to use at best a build, but without the brain to create it and set (and get) good gear there is no such thing like high skull raids.