One of my EDC knives is a small 3" drop point made from CPM S35VN and hardened to Rc 60. I use it for everything including opening boxes, gardening and preparing vegetables. After only a short time, the edge rolls over and it no longer cuts well. A steel will straighten the edge after a few dozen strokes but the edge will soon roll again. My standard method of sharpening is with a Lansky sharpener using diamond stones and I finish with their black hard arkansas stone. I have tried finishing with a fine diamond stone and have tried different angles but nothing seems to make a difference. Any suggestions? Is this typical of this steel?