If he didnt swap the turbo for a bigger one, then there is no way of knowing if it's that or not!
Cam could have shit itself, so yes whip it out and meassure the lobes, and lifters to check they are in tolerance.

Chopshop85, that was so the actuator responded to actual boost pressure making it to the inlet rather than just boost pressure from the compressor housing (it allows for boost drop through IC , etc..).

My gut still says your turbo is the problem, well not even really a problem, just under spec'd for what you want.