Have you pressurised the waste gate actuator and confirmed that the arm between the actuator and the waste gate moves through the normal amount of travel. It is at least 10 years since I did this test so I cannot remember how much it moves but it is visible looking down from above. I used a 12V electric pump to pressurise the actuator and I monitored the pressure I was applying with a gauge. I connected the pipes and the gauge with the pump off then the switched the pump on while watching the arm. It moved across as the pressure increased and as soon as the arm reached the end of the travel I stopped the pump so I did not over pressurise and damage the actuator diaphragm. The arm reached the end of its travel somewhere between 15 and 20psi.
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