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Just to ellaborate on Stu's point - if the razor was not already shaving sharp of an 8k before moving to the 12k, the coticule afterwards would not make much difference. However, what it could do is...

Some, but very few IME are comparable to 10-12K ish levels. I have had 5 different cotis and only 1 is near (but not quite) an Escher. What may happen with some cotis, is that they smooth out any...