how to stop boost creep , how to turn up the boost external wastegate 38mm

well after blowing at least a head gasket because my car creeped to 19psi boost from thej 11.5 psi setting I figured out I had a pinched diaphragm and that the valves wernt opening as far as they could have been hopefully this will fix all that. the car is a 1983 ltd station wagon which is fox body platform with a 4.8 ls engine out of a 07 chevy truck with twin turbos off of a dt466 diesel truck and chineese 38mm wastegates running on microsquirt

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