Same problem with A-10C II and F-5E, I'm using a G940.
update:
I might have solved that.
According to this post
Stick not centered with 0 input - Controller Questions and Bugs - ED Forums (eagle.ru)
(sorry I don't know how to cite it more beautifully)
the problem comes up when:
1. the mod support FFB;
2. the stick is set with "centering spring force" or a non-zero curvature;
3. the aircraft itself has an asymmetric y axis range(different range in positive and negative directions, that's to say the zero position is not in the center of whole range).
When these factors come together, we get different zero positions for the physical FFB joystick and the "stick" on the plane. When the joystick is released back to center, the "stick" in the game would never be in center.
So just disable the "centering spring force" option in the profiler(or something like that name, I'm not an English speaker, not using EN version profiler and don't know the EN expression for this option),and use a purely linear curve, this problem should be solved.
You might have a try but I'm not sure if it also works with spit 9. I don't have a spitfire and just came here by searching "FFB trimming problem".
