How many Healers and Tanks did you have?
Did wearing the mask affect anything whatsoever at 5 stacks?
3 tanks though I think one was in DPS stance (and in any case only 2 are needed)
I believe that is 8 healers (with a few people doing their offspec). I think it was 6 sages (not sure on one) and 2 scoundrels.
Mask did nothing.