Apart from getting rid of enrage, which I think all are aware of, the second most important thing is tempering the jedi AOE attacks, not the Acklay itself. This needs to be done by recognizing which jedi AOE and making sure you keep tagging them with an ability block or killing them off and blocking their replacement if they can AOE. It's a long patient struggle. Some have suggested just going for a 4/4 for another star and that may be best if you're not looking for a challenge and have the patience to do it. Personally I have not completed it yet, but have done decent (about half life on Acklay) but I keep on trying as I'm looking for something to do for fun.Maybe once I do it once I may not do it again as it is frustrating.