did you put the forge waste gate ON the F23?
With a forge wastegate you should be able to change the spring inside, tightening the nut of the actuator arm is NOT the proper way to adjust the wastegate spring pressure. This method is popular because it is the ONLY way to achieve the goal on a stock turbo. With an aftermarket wastegate that has variable springs you should only adjust spring inside the wastegate, the actuator arm should only be adjusted if the wastegate doesn't open up fully causing boost creep at any RPM range.
You probably have the wrong spring in the wastegate, swap the spring out and apply pressure to the wastegate actuator, once the arm starts to move you'll know at what pressure your wastegate begins to open. Use a the spring closest to your desired max boost level without going over or being within ~5PSI of the target. So if your want 25PSI try and find a spring rated for 20PSI, if you experiance a boost spike use a lower rated spring until the spike is gone, then use your EBC to regain any loss in spoolrate.