I know this is an older thread, but this is still happening for myself and a friend. We ran this last night with a 25K DPS and a 20K Healer, and could not beat it. As soon as we finished the last core, he would jump to one of us, already enraged. If he chose to jump to my friend (Healer), he would hit him with 22K for an instant kill. If he jumped to me first, I could survive for about 30 seconds by running for my life and hitting the kolto tanks. But he just keeps attacking with those 18K and 22K hits, and that's just impossible to survive from the get go! On our last try (we tried this about 6 times, I think), he even hit me from across the room. I can't imagine this is the intended behavior for SM...
I've watched videos of others beating it, and it doesn't seem he should be enraged from the beginning. Grrr...frustrating.