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A few strokes on the side of a smooth bottle should get you to the 4k, IF it is as suspected. Tighten up the pyramid and do less. Shave off the 8k good before going forward. Then, 20 strokes on the...

A thought here, Gentlemen. It is entirely possible to have overhoned the razor prior to the finisher. If it has a 'foil' edge off the last hone, (which is easily done!) then subsequent higher grits...