Sorry, have no idea wat cud be goin wrong then. When you said varied the speed, was it in minutes or seconds at a certain rpm level? While in the breakin period you shouldn't ride at the same high rpm level for more than around thirty seconds. I doubt that is the cause anyway. Mine has been running full reps right after the breakin, and nobody has come to the shop with this problem, as long as they had broken it in correctly of course. If this guy doesn't think it needs work, or doesn't want to check it out take it someplace else, it should definetally be looked at. Might be a supercharger problem.