Just finished him the other night, but wiped twice before I remembered a technique I used before. I ran around the room using force slow, interrupts and throwing rocks at him. I rarely took damage and when I did I force armored and rejuvenated on the fly. My companion died swiftly and unceremoniously, I attempted first with Iresso, then Qyzen and finally Tharan, none lasted more than a few seconds. I never noticed the tanks until I read someone else's account.