The Governor does for throttle what a gyro does for your rudder. It effectivly converts your throttle control from varying the motor power to varying the absolute head speed, just as a headlock gyro turns the rudder from a rotation rate control into an absolute possition control.

The throttle and pitch curves in your TX are for matching pitch to input power to give a constant head speed, but there are many other factors which will also change the required power which these curves do not address.

It is important to maintain as constant a head speed as possible for the controls to behave predictably. As head speed slows down the elevator and ailerons become less effective and more control input is needed.

The governor constantly measures the motor speed and compairs it to the comanded speed from the reciever. The throttle curve should be set flat (apart from the zero throttle possition) at a level that gives the required head speed.

You should also match the drive pinion size so that propper head speed is reached using about 85% - 90% throttle. The faster motor speed means it is pulling less current and should run cooler and more efficiently, while still leaving room for the governor to add power as required to keep the head speed constant.