So I am lvl 57 on my barb right now. He's pretty beastly. I've been able to solo everything up to this point, but am having problems with Kulle on Hell. I've used many different specs including high defense with berserker (w/ insanity) and earthquake. I can only get the adds down to about 20% before I die if i sit and bang with them this way. I've tried to another spec that I saw which included cracking rift on seismic slam. I do also have to say that I play on a 13" macbook pro with an integrated card so in certain areas, including this one, I do not get more than 10 or 12 FPS which seems to affect my game play. Does anyone have any advice on a better spec/tactics for beating this guy on hell?