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You should be able to feel the slurry change as you hone on it, the sound while honing will also change it will become less audible.
Did you smooth your hone well by the way?

My first question is how did you figure out that the Jnat was ~16k?
HHT means nothing when testing shavereadiness, shave test the blades and see how they are.
To get the best result off a Jnat you...