I'm having trouble with my VG-10 Endura 4 when I try to sharpen it... I just can't get that last quarter inch next to the choil sharp. It seems like the blade thickens up a lot in that last millimeter and keeps the area next to it from touching the hone. I'm trying with a DMT coarse stone (a Duo-Fold) and I just can't get it. I have no difficulty getting the rest of the blade scary sharp. Suggestions?