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Also, if the edges end up the exact same after stropping (if stropping has some equalizing effect that "contaminates" your "data"), then I figure you can basically pick the stones based on some other...

That does sound like a pretty good way to do it but what do I know? You shave every couple of days right? I bet it'll be tough to hone a razor and then have to wait to test it out...at least it is...