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It sounds like your not making contact with that last 1/2".
270 laps should have made some difference.
Use the magic marker test and the rolling X stroke for 10 laps then check to see if your...

I agree with the above. The rolling X stroke is about the only effective way to hone a razor with a warp. Be sure to use a heel leading stroke with the toe of the blade angled back 30-45 degrees....