Reading the title I was getting ready for the ol use the search engine answer. While reading I then thought Reeds for sure, but after reading your extensive list of things you've done to try and resolve this issue one thing stands out.
PISTON + RINGS!!
How many hours have you got on the top end? How'd the piston look through the exhaust port when you serviced the powervalve? Any blow by past the rings? Don't under estimate the effect that a worn piston can have on jetting and power. Paaaaarticularly off the bottom end!
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