W8YE OK.... "Dead band and hysteresis exaggerations" as you say could/would be an issue, albeit as a sport pilot I've never sensed them. I've certainly however sensed disconcerting grossly non linear carbs on gas engines.

Tired Old Man... There are lots of ways to make things work and my only issue is presenting that increasing the throw of the servo is a requirement for solving the non linearity issue. In some ways, I'm not believing I'm even taking the devils advocate position here as basically I agree with your good advice not only for the issues that w8ye raised but reducing the servo throw and loading the arm effort on an outboard arm hole reduces the effective torque value of the servo and probably increases battery drain. So, for many esoteric reasons your advice was good but not because it is a requirement to deal with the non linear carb. As you, I also set up a throttle by doing middle stick and middle barrel at right angles on servo and throttle arm as the first step. Unlike you, I've had two gas powered planes that fit the complaint of the poster and required expo to counter the non linear carbs.

Last, I'm not sure this has been offered yet but throttle non linearity can be made much worse by over throwing the carb (moving the barrel past full open).