Originally Posted by BeastianSTI
Not sure that he should be adjusting the wastegate arm, rather than the BC if it was hitting boost before, without changing anything.
It's a possibility that it is his bcs, but the same thing happened to me, got tuned, hit full boost for a couple weeks, adjusted 2 turns clockwise to add preload on the wastegate. Hit full boost for 6 months after. I then detuned my car, stage 2 OTS, noticed I was now over boosting. Back the wastegate arm 2 turns counterclockwise everything perfect.