Hi!
I think you should set the default X sensitivity for touch devices to 5 instead of 10.
I was experimenting with it yesterday, because XR591 was really annoying to drive with the default control settings on my Android phone. The steering wheel always felt sort of laggy but it showed the most on this track, because there's a lot of twisting turns. With sensitivity = 10, I ended up last racing against SuperTux AI most of the time. When I set it to 6, Iimmediately finished second, third, third, second on the first four successive race. Then I tried going even lower and set it to 2. It felt really great but I started losing most of the races again. I guess the steering wheel got too jittery. But the feeling was great, so I tried 5 instead of the fantastic 6 and it was perfect.