Hmm. First thing I would do is check the graphs in controller sensitivity in the game. Do they also reach 100% when you’ve only rotated (or pushed / pulled) 30%?
What about actually looking at the ailerons in the plane. Do they move further when you get beyond 30% rotation of the yoke?
(If you can’t see out the window in cockpit view you can position the drone camera then press C to control the plane from drone view).