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Get a good shaving edge on a razor, then just do 30 water only strokes on the jnat. Might not get the jnat feel, but I'd the edge is too dull to shave with you might not have a razor stone.

Diamond plates slurry is not always the best!
1) make sure your stone is lapped flat
2) surfacing the stone can help (taking any slurry stone or maybe the 8k synthetic stone to smooth the surface...

I have a shoubudani mizu asagi that I like a lot. It is a nice 6"x2" that I use as finishing stone with just water. I flattened mine with sandpaper as I didn't want to risk my plate, went...