Most everything I see says SCHx2 DDx4 SCHs embrava and lock on a chest if possible so its up 100% of the time, plus AoE Phalanx, Regen, and Enspells all wreck things. Only need to get to 100 5 times since you get a piece just for beating the boss + whatever happens to drop into the lootpool. Also its good to have everyone on ventrillo or teamspeak to speed up communication.
I can attest to this but that it's going to be often impossible to get to 100 because of the randomness aspect. For example, first run last night in a PUG I distributed my vent server info and 5 of the 6 hopped on. We made it to floor 74 even after having one person basically cost us several minutes on a floor that should have been relatively quick.
The next run we made it to 84ish (might have been 86).
Then we only made it to 64 because of 3 jumps in the 1-10 range that were kill all floors and 2 jumps in the 20-40 range that were lamp orders, which absolutely suck particularly if they are in a massive layout.
Setup was: SCH SCH WAR WAR SAM DRK. I never felt that damage was lacking.