Couple of things. 1. The factory edge may need renewing or 2. you may have curved your edge trying to get it sharp. Either will benefit from a jig to hold the edge constant to establish a new straight edge. That is done with even strokes of consistent pressure. At no time use much force. A few passes (each side top & bottom) may produce the telltale burr which you can feel. It will be on each cutting edge but one side of the BH only. Remove this burr with polishing compound on a cotton, leather, or cardboard wheel & you're done. I sent you an e-mail.