[MattW]

I would suspect that there is something wrong with your steering pot. From memory it won't let you change steering balance (swap the *) unless it sees the stick go so far into that travel (it might even be full). Yours isn't getting that far. As Adam suggested, I would have gone with the calibration "Adjust VR" routine, but if it gives a steering error, then I guess there is something actually wrong with it.