Hmm we lack in the mage department so we do it old school. 3 brds sleep everything and melee just pull em off by twos. we usually have 4-5 blms. didn't think about astral flows. I'll suggest that. We usually have the room cleared in about 10 minutes, 15 max and then go all out on the boss. We just beat another one the same way. Seems to be working so far.