Depending on your mouse sensitivity you may have to adjust the head tracking sensitivity in games where head tracking isn’t handled by Direct VR to get 1:1 head tracking. While usually a default is dialed in that fits the default mouse sensitivity, that may not always be correct for your configuration.
The head tracking sensitivity setting is the last one on the main page of the vorpX ingame menu.
You can find this and other useful hints in the “Essential Hints” guide in the help.