The suspension bind does not occur at the outside of the bushings but more so on the connecting pin/bolt that hold it in place. Shaving off the outer edges of the bushings will do nothing to prevent this binding . Spherical bushings however was the answer to this .
Polly bushings actually create the snap over steer , and I would never recommend them for hard cornering, shaved or not they will bind. They are great for a straight line launch . For the best of both worlds spherical is the way to go.