If I'm sharpening a knife with no sharpening choil the DMT duosharp doesn't seem to hit the part of the blade right after the ricasso. I think that's what the part is called. With knives like that I have to put the knife down with the ricasso over the edge of the DMT stone. I don't know it the edge of the stone isn't a perfect 90°, or if the edge doesn't have diamonds embedded, but I can't get the start of the blade edge sharp. The Spyderco Chaparral is one of those knives were the ricasso doesn't allow me to put the start of edge down anywhere on the stone. The Spydiechef has the edge lower than the ricasso so I don't have to sharpen the start of the edge on the, so sharping if work great. Is this just how the DMT stones are made, or am I missing something?