Meh, I prefer to save Perfect Balance for bosses. Weaving in Rockbreaker through your combo when 3 or more mobs is more than enough dps, I only use Arm of the Destroyer when 6+ mobs, though I will occasionally throw a couple in on 5 mobs if I have all buffs up and purification off cd. Spread Dragon Kick around as you go through combo and pop all your oGCDs as necessary. Also try to target smaller mobs in the middle for RB as some of the enemies with larger hitboxes will, how do you put it, like eat up some of the space which could cause you not to hit some other enemies. I don't main monk of course, but I do run my dungeons pretty much exclusively on monk and in my experience the only other job that comes anywhere close to monk aoe damage is smn. I regularly do double the damage of other dps using the above considerations.