This quest was a one time and done for me. At the time, I had a full suit of Champion gear with a few items I crafted myself. T7 had gear from planet commendations and some GTN stuff. I guarded him and let him roll. He died almost every fight and I just popped med packs and defensive CD's if needed. I did not run into any bugs in the fight though which for some, are apparently abundant. I am a full Def spec guardian. Like some other posts, I just stayed on the Emperor and kept interrupts going. Splat.
I wish I had known about the EMP thing but I did it without it.