Cambo,

Not to sound rude so please do not take it this way. If you are getting the same issues on just about every plane you do as far as the throttle is concerned thgen you may want to consider you throttle setup. You should have sharp curves, you should have no binding and you should be smooth al lthe way through.

Glow engines are more or less tolerable of a not so good setup as the power band is pretty wide, gas engines will suffer to a degree but no being smooth right when you need it because the power band is pretty narrow. It's not uncommon to be at max rpm LONG before the throttle plate is fully open which, depending on you servo arm and throttle stick translation could me you are a full power long before 1/2 stick