i have a similar problem except my actuator is untouched except for the high boost mod which is on a switch.
dont mean the thread jack it just sounds pretty much the same as my issue.
car has been running fine for 1.5 years since i owned it but since saturday it only boosts to 5-6 psi instead of 8-9. i havent changed or touched anything....
it otherwise drives normal :S
pod filter, split dump, cat back exhaust, safc neo.