Hello, I bought the mb-102 to remove the burr on my knives with precision but I have a problem with it. even when tucking in the constants, I roll my edges in the places where I have the belly of the knife. I tried lowering the setting by two degrees. It's better but still not perfect. Do you have a solution/technique to do it correctly? the impression that this system is only useful on straight blades without curvature otherwise the angle changes by raising the knife to follow the curve.. Thanks for your help