huh. i could be mistaken, but the wastegate isnt what regulates the boost, well unless it just isnt closing. it could be the spring in the wastegate? althought id have to do some research. i have heard of people running different springs, so when they reach a certian psi it open, perhaps they did that. not sure why they would want it to open so early though. how much boost does the stock model usually run?
post a thread and state you issue and then ask for possible causes? thats what i'd do. then check each plausible answer out.