Misfire at cruise, popping/afterfire at 3000RPM

AJ/FormS said

I'm not sure yet that OP knows where TDC compression is. Which is why I carefully worded it the way I did.

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I verified that the timing mark on the balancer is correct using a piston stop, and brought each piston up to the top with both springs closed. Please correct me if that is not TDC on the compression stroke.