Umm, BLM should be parsing 280+ on Twintania. Too much AOE during the intiial phase and snakes to drop down to the 200 range, unless the BLM gets excessive stuns/conflags.

From what I have seen so far, Excellent MNK out dps everyone second close would be SMNs and third BLM.
Monks are extremely susceptible to bad RNG on Twintania. Their encounter DPS can fluctuate by like 60 from stuns and conflags, nevermind general drops like divebombs.