IIRC the profile has vorpX’s gamepad > mouse/kb emulation enabled for a bunch of reasons. You can configure its snesnitivity and button mapping on the ‘Input’ page of the vorpX menu.
With TrackIR enabled the gamepad > mouse/kb emulation *might* not be be necessary. Not 100% sure, but try to set ‘X-Box Gamepad Override’ to ‘Off’. That will enable native gamepad support. if you still have working head tracking afterwards, you can leave it off.
BTW: You can also play with motion controllers if you want. vorpX can emulate both mouse/kb and a gamepad with motion controllers. Also fully configuarble in the menu.