On opening the game and map the wheel aggressively tries to self-centre. Turning off Force Feedback makes no difference. The only way I have found so far is toggling the Turn Wheels Inverting button, which restores normal Force Feedback and no self-centring. This has been occurring since installing the DLC patch.
Further investigation: The wheel will not respond correctly until you go into the Control menu. Once in the Control menu the wheel will begin behaving correctly after a few seconds without attempting to change any of the settings. You can then exit the Control menu and carry on as normal.