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There has to be a frown in there somewhere or maybe spine is crooked. I have a setup of lapping film on 1 inch x 6 inch granite that I use for a blade that has a crooked spine. You can get that area...

King hones are very thirsty. I had one, I use a dmt 1200 now. No lapping, just break it in first with the side of a screwdriver.

If it were me I would go the my 600 dmt or maybe the 325. And take off enough to ensure contact with the hone along the entire edge. My thinking is I would just do it now and get it over with. YMMV.