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I have heard this happening from MotoIQ, where the external wastegate flange when welding on the manifold isn't round causing issues. Also he said the external wastegate could have some sort of build up causing the valve in the wastegate not to open correctly or all the way.... Easiest way, try swapping out the EWS, if that doesn't work, then check the manifold.
MotoIQ had a youtube video on wastegates.
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 Turn and Burn! 
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