I don't know if this is related to your problem, but if your fuel pressure is reading 40psi, your FPR is probably stuck open. Stock fuel pressure is supposed to read 36 with the pump on, engine off, and 29 idling.
(I'm surprised no one mentioned this when you said it was so high. Am I missing something guys?)
When I had this problem, it made my car run too rich, which resulted in poor performance and hesitation.
Edit: This is for NA. Is turbo pressure normally higher? The bosch book I have doesn't differentiate.