Never reAd about using the cutter to zero my press. Figured that one out by myself. If your cutter is not zeroed, you can not cot all the way down without gouging the ball.
Like the tape around the plug idea. I have an older AMF jig and the ball walks a minute it with it at times.
I use a bevel knife to finish up and then a bevel sander both on plug work and Switch Grips.