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+1

I know that when I hand sand a razor and polish it the
edge often suffers -- a lot.

My guess is that the bevel is not well set. This is one case
where a hanging hair can be used to map...

+1
sand it with some 1k or 2k 3M wet dry and see what is under the dark
places. You need to do this for sanitary reasons as much as anything.
If you have any pits I like to use a chop stick to...