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I've done a few more heroics with the 3/13/55 build and seem to have 1 problem in every run. I pull agro half the time, just casting what I thought was a good rotation:
Corruption > Immolate > Conflagrate > Chaos Bolt > Incinerate spam
Redo DOTs, if needed.
Usually when I get to Chaos Bolt, I've pulled the agro off the tank.
If you don't want to change your PvE spec you can always adjust you rotation based on your tank. If your pugging you'll run into some tanks that you will pull aggro off of all the time and some that no matter what you do you can't get aggro. If your pulling aggro right away try throwing a corruption and curse of agony on the mob before Immolate, or do chaos bolt before Conflag. It's not gunna get you the best dps, but sometimes all the tank needs to gain and keep aggro is that 1 or 2 global cool-downs.
One thing pugging teaches you is to be flexible, to adjust your playstyle based on the others in the group. While pumping out the most dps is ideal sometimes you'll run into tanks that just can't handle it, be it gear or ability, and it's better to watch your aggro and let the mob stay on the tank than to become too dps oriented and turn every pull into a cluster.
Whenever I go in with a tank I don't know I go very soft on the first pack or two of mobs to see how his aggro is and base my rotation on that the rest of the run.