I have the same problem with my Logitech Extreme 3D Pro joystick (stuck at about 1500 RPM) and I didn't use Steam. It works perfectly with XP 10 but in XP 11.21r2 only the throttle is not recognized even when using F1 and F2. The joystick seems to be calibrated normally on the settings page. I have no other controllers listed in the Device drop down on the settings page and the joystick behaves normally when calibrated using Windows 10. Roll, pitch, and yaw calibrate normally and other keyboard commands function properly. Puzzled and a bit frustrated...