Trying to get my xud back to how it use to be!?

[silverzx]

Sounds very strange. Who was the T2 off of?

I'd probably turn the fuel right down and adjust the idle so it's more or less back to standard boosting 14 psi and start over from there. If all is well until say 18 psi then it might be wastegate related. I don't think T2 wastegates were designed to be holding back 20+ psi and can creep open hence why a lot of people opt to weld it shut it purchase expensive after market ones like Pompey.