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I get very sharp edges using one of my Jnat finishers. Sharper than I used to get from coticule of Escher. I usually finish with water only. I don't think it does really matter what stones or naguras...

It is a very soft stone and will raise a lot of slurry on a coarse hone, I use it on my Jnat barber hone and Ozuku Mizu Asagi, both finishing hones.

I have got this one: https://www.amazon.com/Natural-Nagura-Chisel-Sharpening-Renewed/dp/B07T8JPVBT/ref=sr_1_1?keywords=yellow+pulp+nagura&qid=1571917825&sr=8-1
Mine unfortunately came without the...

Get in touch with a reputable seller of Jnats, tell them what you want and see what they have.
I have gotten good stones from japan-tool.com, japanesenaturalstones and tomonagura.com