Another tip, straight from the readme,
When setting the joystick response pitch curve for aircraft with Advanced Flight Model (Su-25 and Su-25T), it is recommended that you remove any joystick insensitivity near the neutral / centering area (the so-called “dead zone”). You should also have a linear response curve; meaning that the joystick pitch setting curve should be a straight line from corner to corner of the response field. This is recommended because any nonlinearity will distort the correct balancing of the aircraft. This AFM balancing consists of angle of attack, G-loading, and control stick longitudinal diversion. A dead zone would create a “flat” response area (local control insensitivity zone) when balancing the dependencies in the mid-angle of attack range (5 - 10°). This would make angle of attack and G-loading control difficult.
For aircraft with AFM, it is also recommended that you reduce nonlinearity of the yaw response curve. This is because the nose wheel turning mechanism of Su-25 and Su-25T possesses a differential mechanism that nonlinearly turns the nose wheel according to the amount of pedal deflection. Hence, the yaw response curve nonlinearity will cause a significant increase of nose wheel turning angle. Such nonlinearity when giving rudder inputs will make it difficult to hold the aircraft on the runway during taxi, take offs and landings.