Its 100% on the correct spline, I marked it with a scribe. Although if I did fit it a spline out, would this make all the difference?
Next week I'm going to have the lever and springs off it again, I think it only has that quarter of a turn free play because its missing the idle spring on the governor. I'l take the lever off and mount it the quarter of a turn clockwise to the other end of the freeplay. According to my knowledge that should make the throttle lever actually sit against the idle adjust screw, and also allow me to wind the max fuel screw in (quite a lot) without raising the idle speed to excess speeds
I don't remember reading anything about moving the lever a couple of splines in the governor mod thread? And I read it about 3 times! Oh well, at least I know what I need to do to extract a silly amount of extra horses. And in other good news its still running well with the throttle lever where it is and the max fuel screw right out.