Dan you whinge like a bitch, how much did i charge you for that bleed valve? Yeah thats right nothing. Lesson learnt boost gauge first then bleed valve, it went good though didn't it?
Anyway i think you car is brushing the boost cut, back off the boost until you throw a proper gauge in and then there are several ways such as fuel/boost cut defenders (around $ 200) and various other modules to get around this problem. Or do a Dan and get a powerFC.