You can recalibrate it. Email Thrustmaster to get their dedicated recalibration utility that writes data directly into the joystick.
Thanks for the info. I'll send them an email.
After more testing I believe the problem is more mechanical in nature than software. As mentioned, when I deflect the stick to the right or left and release, on the X-axis it returns to a spot just to the right of center. However, any slight force and tends to move back to it's center point. So I just think I've got a less than optimal centering mechanism in my stick.