I like to start with a slurry made with a DMT - there is no issue that I'm aware of using a DMT to make a slurry on a JNat? I do normal x-strokes or rolling x-strokes depending on the blade. I dilute incrementally with my fingers dipped in water a few times until almost clear then rinse throughly and do some strokes on just water. Then I rinse again and squeegee as much of the water off the stone as possible with a finger and do ultra-light strokes until the stone is just barely wet (damp really) but not bone dry. At this stage there is very little resistance from the stone and I get very good results. Microscopy of the bevel looks like fine sparkly dust rather than scratches. I do have some JNats that leave more of a mixture of the dust pattern and scratches. I use basically the same approach with all of my JNats and get very consistent results. YMMV...

-john