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some comment on the DMT being a product of nature:
That´s... not the case.
Diamond, of course, occours in nature.
But Aluminiumoxide, the abrasive that shaptons (most certainly) contain, does as...

In this video Hi_bud is using a high grit japanese natural stone in combination with different low to medium grit slurry stones, simulating a whole stone progression on only one single stone.
...

Have you tried reproducing the conditions that seem to fit,
like finishing the Iwasaki on the DMT 8.000
and follow that condition you know to be good
with just 5-10 light and even strokes on...