You just did massive surgery on this beast. Double check the exhaust manifold is tight and there is no leak at the gasket. Also check the wastegate, make sure it's tight. I would just recheck all the nuts and bolts at the turbo and check for the obvious leaks. As far as spool my 50 is spooling at roughly 3500 in 4th gear (20psi) so for you to only be getting it a few hundred later does not seem so bad.
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482whp and 525tq stock motor
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