I know what you mean. About a year or so back,a bunch of us here got on this subject of going off tach readings of where the barrel is when its at full rpm vs the barrel full open. We thought about dialing in the high end needle when the rpms are at the maxx and the barrel in whatever position it is at that point short of being wide open.

Would be less air going in but nobody ever really tried it to see how the engine would react. You want too? Anyways repositioning the rod in the servo arm will take care of it.