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As Lynn says in that video, it doesn't have to be perfectly flat (though flatter is better). In fact it's probably flat enough, but for some reason the surface texture is rough. Perhaps it's because...

If your Chinese Razor is like mine, now is a good time to look into a rolling X stroke. I'm pretty sure that's what tehy used to hone them, so if you're using a regular back and forth pass you'll be...