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Not all Jnats leave a hazy edge. :p

Easy choice. :)
After Shapton 16k all you need is one good fine, hard Jnat & some water.
Your synthetics can do the rest. You can experiment with Nagura as you go.

I do remember that James. I have one also that became very intimate with the concrete path. Finally became a very good knife finisher. :)
I really think the base stone does play a part but it...

Stones from the same strata can differ so the name of the mine is no guarantee.
As my friend So (Japan-Tool) says "There are inferior Nakayama stones and superb Bajiyamas, You never really know...