I don't think the Nakayama edge needs improvement. Diamond pastes are known for being sharp but harsh. Chromium oxide is known for being smooth but not sharp enough. Nakayama stones are very sharp and very smooth. Proper stropping is all you should need afterward. I've found a strop with lighter draw to be best, something like horsehide, shell, or SRD Premium I.
Agreed. The two Nakayama's I have produce edges similar in sharpness to something between .5 and .25 diamond pastes. Much smoother. Much. I really don't know that you could improve on the edges they produce. Sharper? Perhaps if you have some mad honing skills. Smoother? Unlikely.
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