I beat most of these bosses with complete ease, and then two normal guys continually defile my corpse. I'm talking about the wraiths near the Angel of Death. I've got a few tactics, and maybe it'll just be one of those "I quit last night from frustration but when I go back to it I'll defeat them with complete ease" scenarios. Main tactic so far is to run/boost around while charging the boomerang to fling at them, then as it grinds on one I go after the other and then run away from both, repeat. So far it does me pretty well until the third one pops up with the crapton of other dudes. But yea, I hate them. So much.