Balance was the BIG thing I forgot to mention. You need to reduce the balance factor. I did it by pressing a slug of aluminium into each of larger holes in each crank wheel. If your crank is anything like mine you will have a hole in each web each side of the crankpin. One hole is larger than the other. Opening a balance hole will INCREASE the balance factor which is opposite to what is required.
With weeks between sessions on Pete Sales dyno, inbetween which I pressed in the slugs, Pete commented immediately after the first rev of the motor about something being different. It is really obvious the difference.
The bike also went from breaking brackets, chambers, and even the frame through vibration to being nearly turbine like at revs.
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