I have a 2018 X3 turbo r XDS with appx 7500 miles. Under heavy throttle or load I get code P0234 (overboost issue), engine light comes on and you hear the wastegate blow out the built up boost. I have done some research and replaced the solenoid valve and the actuator assembly and the problem still persists or has even made it worse. Now you get the blowoff happening sooner. I have tuned the actuator to 6psi and no difference. Any suggestions or thoughts are much appreciated. Thank you!