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So in effect you're using your hone as if it was a strop ? AFAIC edge leading strokes is a better way to hone. I won't even qualify that with YMMV. Give it a try while you're experimenting, you may...

Assuming you are correct that the j-nat is 10k it seems like to me that the 16k glass stone would be the one. The 12k naniwa would probably be real close to what you already have. OTOH maybe some...

Welcome to SRP. I'm with Gary on the 12k naniwa. The 16k shapton glass stone is also in the same price range and is a proven stone that a lot of guys like.