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If the blade is warped the opposing pressure technique will produce a crooked bevel, and the frown will keep coming back anyway.

I've never had any luck with the X-pattern on warped blades, it gets the middle sharp but dulls the heel as it comes off the near side of the hone :-( One of the things I've been thinking about...

Is your hone lapped and flat? Also, check the spine for curvature, it's easier to see there. You should also mark the bevel with magic marker and give it two laps on your finest hone, then check to...