Kept in mind this is an experiment using a single vintage throttle body similar to ones used on some early nascar
Unlike a carburettor you set up the max fuel flow and the metering shuts that flow off down to idle, mid range is adjusted by moving the throttle plate so the air supply matches the set fuel,
Because this is a custom application it wasn't designed for motorcycle applications and the throttle plate ended up set way in the rich direction to get enough fuel mid range after restricting the top end adjustment so much to suit the small engine, but the metering can only move so far.
End result rich idle and at full throttle the plate was sitting about 5 deg off full open. That's how it was for this test.
So I hope drilling the fuel spray bar for more fuel will let me open the throttle plate in relation to the spray bar/throttle shaft a little, fixing all issues
Fingers crossed