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I watched that first video you posted.

To answer your question, no, I do not think mirror polishing on bevels is anywhere close to as important as that video implies. In fact, I would suggest...

DE = Double edged disposable razor blade.

Humidity it absolutely critical....but if you are getting good shaves, I'd not waste worries with it unless seeing the razor perform such a feat will make you happier.

I "get" the concept that a...

Personally, I use HHT to gauge uniformity of the blade (does it cut the hair the same way in every portion of the blade). Once I feel I have suitable uniformity I go to the final and most important...