You are far, far better than I am if you can solo it. My warlock is 315 and I have gotten one-shotted by Alak-Hul on more than one occasion. I must be doing something wrong because every group I go with gets massacred down in the boss arena. That is, if I even have a group to try the fight with as almost everyone leaves if we wipe once during the strike, which still wouldn't be too bad if people didn't love running straight through the shrieker room with complete reckless abandon.