Lewis, nope, not sure what that would gain? There is plenty of cable length to adjust with on the engine end. Under edit: On your Kohlers, in which of the two brackets is the spring in the 4th hole up? The governor bracket (the left bracket in the photos below) or the "Speed Control Bracket" (the right bracket in the photos)?
Brendan, that I believe, would have the same effect as moving the spring to the top hole.
Don, how much did you loose on the top end and what is your idle RPM???
Art, if I figure it out you're welcome to the notes. I do owe you for the use of that electronic tach. I'm gonna have to get one of those for myself.