As far as advice goes, this is the best. The only thing I can add is that his kill you now spell had no cast bar. You simply focus on him, and when he is standing there casting with no cast bar, INTERRUPT. I don't care how good your gear is, he will kill you if you don't interrupt the non cast bar spell.
I stood back to the left of the door and sent T7 in, waited for his uglieness to port down, and immediately charged and started to put the hurt down. You will loose your target to one of the clones when he summons them, but look for the wounded one and pound his face, ignoring the clones. Interrupt his spell, ignore clones, and hope you kill him. Yes, when I finally succeeded, when I finally got the mechanics down, it was a letdown.
I hit 50 in January and spent a month failing to this quest before I gave up on the character and rolled a Vanguard on a different server, and then a couple BHs on other servers just for fun. Just for the sake of beating my head against a wall I tried it again yesterday. Succeeded in some corellia gear, some Voss, and some belsavis. It is not a lol fest like some people claim, but is remarkably easy once you learn the mechanics. That, or the lol fessters took a Vanguard with them and the Trooper did all the work while they took a short nap.