At 44 I do this on ^^ mobs: I start out with Chaotic Malestrom, Curse of Emptiness, Curse of Nil, and Freezing Whirl (not sure if the debuff part of this stacks, but I gotta do something while waiting for the tank to get good agro). I throw Ice Flame and Nil Distortion so they can start working on recast, then I wait a few seconds so the tank can build some agro. Then I follow with BSS, Noxious Bolt, Flashfreeze, and reapply Chaotic Malestrom, and another BSS. Then I finish with another Nil Distortions (By this time I'm on the verge of taking agro) If the mob is still standing, I hit it with another Ice Flame or BSS. If at any point I do pull agro I hit the mob with Aura of Darkness, then Bony Grasp, and back up. I usually do around 5 or 6k damage depending on how many other DPS people are in the group and average around 120-160 dps. The tank makes a big difference in the way I play too. If it's a good tank I will be closer to the 160 dps range, maybe more. If it's a bad tank, I gotta use a different strategy.