Never buy second hand turbos! lol
or if you do get it recon'd before bolting it to your car.

I would hazard a guess at your actuator as they can have quite a range of adjustment.
You could try bypassing the amal valve as well to see if that is the problem, not 100% on this tho as i dont use one.

Take it to a tuner and get them to have a look at it. If you've had the actuator off etc theres a chance the engine will be out of synch.