Vehicle Pitch in Slow Motion

@GSSLaunchNetwork to start, 20 is a very high value, and you are using it both in the rotator and the shock.
Another problem you have is that the rotator is in the part-group of the plane body because it's base is attached to it. Try only using stability on the sky itself and not in the rotator or the shock

@pedro16797 Well without turning up the stability modifier to 20 it becomes basically impossible to land on the skis without breaking them. And it only affect pitch without affecting roll/yaw.

Try setting the stability slider to 0 in all parts and try again. As stated in the slider tooltip, you should increase it's value slowly