Clean out the hoses that connect the turbo to the blue boost control solenoid with carb cleaner, especially the short hose that connects between the turbo outlet nipple and small white the t-piece. This hose has a small restrictor inside which is easily blocked.
The more blocked it gets, the more boost/boost spike you will get, as it prevents air getting to the actuator.
While your there squirt some cleaner through the solenoid and if possible excercise it with a 12V supply while cleaning.
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