imo, turbo off. dump off.
get it all in your hands and have a darn good look at movement with the dump on/off.
even paint the flapper to see its not touching anything.
then once its all ok, start measuring. find out how big the gate hole is etc.
then wire the gate open to max, and see what happens. if its still doing it, hole needs to be bigger. If its ok, connect actuator up.
if the problem comes back then the actuator is f**ked, or you failed off car checking of interference that's bout all it could be unless cam timing or something is way out perhaps.