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Looking at your progression again, I'd suggest trying 3-5 strokes after your 16k on your Jnat completely dry, no water, no slurry. Of course the 16k should be shave ready first. Might sound crazy...

All I can think of is try without slurry & use fewer strokes. Assuming you have a shave ready edge at 16k it's easy to lose it with too much subsequent honing. It's even possible your Ozaki is not...