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Food for thought, but if it were me I'd drop the Jnat and the 20k from the progression then. Assuming of course that you don't find a blade that likes the 20k better than the Arkie.

I would hone the razor with the 12K and then hit the Arkie with it and check under magnification to see where it fits. Then I'd shave off the edge and see if I felt a need to go anywhere after that.