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On high boost shifts from 2-3 and 3-4 the wastegate and blow off valve seemed to get caught in a harmonic cycling fit, which prevented spool. If I slammed the throttle shut, waited half a sec or so then opened it up again it would be fine.
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Sounds to me like your wastegate spring is too weak or sticks? Maybe a problem with one of the "sense lines" vacuum/boost lines? Great video and very quick congratulations!