Cm 2250 debacle

[Rig Wrench]

Lookin for some input from anyone. At a loss at the moment. Got a CM2250 stet at 500hp in a 389 Pete. Only makes about 22 lbs of boost. Revs up through the rpm range correctly. Air intake system is leak free. Fuel pressure is good. I tried a new map sensor, new exhaust back pressure sensor, and even went as far as putting another ECM on it from a good running truck. Same result. It acts like a derate but no CE light. Engine brake works as it should producing 30-32 psi at its highest setting. I've been messin with this for 2 strait days with no luck. Any suggestions?