is this derek? most of the smoke is/was coming after a hard pull letting off which leads me to believe stem seals, but also could be rings not seating all the way.

another thing i thought of is you last motor toasted itself and if it shot oil through your exhuast your mufflers/resonators may be saturated w/ oil as well causing some of this. it's a pretty restrictive exhuast anyway, so replacing it w/ something less restrictive will help w/ your power and maybe smoking if it's coming from the packing inside the muffler/resonator.