Quote Originally Posted by joelkerr View Post
Last week I tried again with a hanging strop, being very careful with the tautness and angle and everything, and observing what happened. I noticed that the kamisori would scratch the strop at both the heel and toe, but only on the hollow (ura) side.
It's possible you have a burr on the offending side or it's a fault in your stropping. Without looking at the edge under magnification it's all guessing.