Instead of trying “fixes” I would suggest you accurately diagnose the problem. Start by attaching a T-fitting to the pressure line between the ALDA and the intake manifold. Gages are cheap at harbor freight. Once you are sure that you have a boost issue you can start testing the various elements starting with a vacuum test on the ALDA. After that ensure that you’re have proper vacuum in the system and replace as necessary. Finally test wastegate actuator, transducers and switchover valves.