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Either your Nakayama is not suitable for finishing a razor, or you are not quite where you need to be with your honing technique.
A good Nakayama will not destroy an edge if used properly. Period.
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My limited experience with this stone says no.
I compared it to my Nakayama Kiita and wasn´t able to tell a real difference.
It gives a good edge, but I hardly can imagine any better edge than what...