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How do you know the Naniwa destroyed the edge ? Did you shave off the first lot of Belgian honing, were satisfied, then proceeded to the 12k & retested ? I'm saying it may just be a cumulative...

You don't say how many passes on the 12k SS so you may have overhoned the first time or not honed enough. It is easier to assess if you look at your edges under magnification. In any case your...