Can it be that a Prosharp machine alters the profile of a runner due to repeated grinding?  After about 7 sharpenings through my LHS with a Prosharp AS 2001 my runners with a Quad XS Profile began to have a tendency to catch an edge. I compared them with a second set of runners with a fresh profile on them. The fresh profile has less steel in the front and rear than the older one. The difference is not big but you can definitely feel it with your fingers. I made a direct comparison between the t