Yep. I have to chuck some of my mandrels up and polish them down a bit. I always polish just a thou or two taper to the mandrel also. Below the sizing section.If you are cranking hard enough to make ridges you need a smaller mandrel.
I don't get ridges I can see or feel.
My point in the post was, I wish someone would build a more precision version of this die because I think they have real benefits