Futaba expo is a nagative to make it less sensitive around neutral. Start around 35% and test. Check the result by moving the stick from center and to about half the throw then the last half of movement. The outer stick movement should be much more movement in the surface for equal input. For the elevator also 35% and rudder 25%. Throws are set at 45 degrees in each direction.

I normally don't use dual rates for this type of plane. If you want to use dual rates for more precise flying reduce the throws to about half for elevator and ailerons and 60% for rudder.

EXCAP232