Update:
Fitted the actuator and ported some of the wastegate earlier:
The boost is alot more stable now but still nowhere near perfect, at least its not hit fuel cut again.
I wasnt sure how much of the wastegate to port, I could take more off but there were some hairline cracks already there and dont want to make matters worse.
Should I swap the decat back out and fit the Cat until I can sort something else out do you think?
I tried a roadtest with 3/4 of the air filter blocked up as well and didnt seem to help stabilize the boost.
Only problem at the moment is I cant setup the actuator with the creep so atm it is just roughly setup the same length as the old one.