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Do you get a good edge from your Nakayama with different tomongura?

In general that is correct, there are exceptions.
You have to make sure your tomonagura is softer than the base stone so you are not drawing too many particles from it, otherwise you just can use a...

You need to look for a piece of stone that is softer than your base stone and can break down really fine.
You may have to try several to find the most suitable tomonagura.
It will be a safe bet...