Agree with your thoughts about sensitivity in pitch and yaw, roll doesn’t seem quite as affected.
In contrast to PZL, I would always recommend a linear curve unless all other options are exhausted. Using a curve with exponential extremities is not how aircraft controls operate and It will create unrealisticly large deflections with minimal input when nearing the extremes (or even greater than 50% depending on the curve). Most normal sized joysticks and aircraft should be easily controllable using a standard linear curve.
Increasing deadzones will help a bit with sensitivity and probably be quite realisitic for GA’s. In most of the older and smaller aircraft I’ve flown, sometimes the controls can have a bit play, particuarly in the seat that is flown from most often.
Others have said editing the setting below helps out with sensitivity for the time being.
Under [AIRPLANE_GEOMETRY] section
controls_reactivity_scalar = 20