Hi - what settings of the joystick null and sensitivity values are the nearest to reality?

No such thing. The adjustment is there so you can get things to your liking.Best way to calibrate it is to sit in external view and see how far, and fast the control surfaces move against your input. Adjust to suit.I then suggest you buy FSUIPC, which not only has a far more sophisticated calibration system, it also allows you to assign sensitivities on a per-aircraft basis, which has to be the best solution!Allcott