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Usually with a warped blade, A rolling X pattern. using more of the side edge of the stone rather than the center of the stone seems to work well. I am probably not decribing it well and hopefully...

Sounds like you may have a slightly warped blade. Try putting a thin line of magic marker along the cutting edge and do 6- 10 laps on your Norton 4000 stone. It will take off the marker where it is...