After almost two months of frustration, I've finally been able to hone my Dovo 5/8 tortoise. I finally got her wicked sharp by adding two layers of electric tapes on the spine prior to hitting the 4k. Within about 50 strokes on the 4k I could see and feel an edge forming. So more strokes on the 4k followed by the 8k, yellow coticule and Cr0 and wow!! Can't wait to shave with it tomorrow! I can't believe I spent all that time trying to figure out what was wrong with that razor!!