I have a set of Naniwas-1K, 3K, 8K, 12K

I read on a thread here recently (I forget where, and who) a message posted saying that more than about 10 strokes on the Naniwa 12K seems to take the edge backwards, with microchipping etc.

I wondered how many others experienced this, and what advice and experience might be out there with regard to the Naniwa 12K as a finisher--just a light few passes, lotsa passes, what has given you the best results?

the student is seated at his desk, awaiting the teaching staff of Straight Razor University to offer wisdom!