Stick animation in cockpit vs real stick movement?

[Pegas44 (Andrey)]

stick animation in cockpit looks non-linear for linear real stick movement, specially in roll channel there for the first half of real stick movement - rate is normal, but for the second half rate is dramatically slower. (I use linear axes mapping for real stick in control bindings)
looking for control surfaces movement on external model - they movement rate is the same as real stick movement rate