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Another suggestion, because it sounds like you are diving into the thick of it -
Any chance you can find some smaller carbs (or even F.I)? Because you are trying to shift the power downward you may benefit from the increased velocity of smaller venturies. The stock carbs/cams/etc are all balanced to provide maximum power around 10,000 RPMs.
What did your plugs look like? Can you step-up one heat range?
You could also try dropping to a 30-weight oil. A top-quality (Repsol, Motul, etc) 30-weight synthetic motorcycle oil (5W-30 would be best for mileage) may show some mileage improvements also and should provide plenty of protection. You could try Rotella T5 10W-30 synthetic blend (no modifiers, good levels of ZDDP) if you didn't want to go up to a high-end oil. Because of the light loads and low RPMs I don't think you will run any risk of engine damage by using a 30-weight oil instead of a 40-weight.
Are you using a non O-ring chain?
I'm thinking different cams, tuned for midrange, would give the biggest gains.
Jay
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