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When I have used the 1000 grit sandpaper I have noticed two things.

1. Under a 30X microscope the edge looks very ragged and the 4K hone has a lot of work to do to get it back into reasonable...

One of the things you did not mention was the amount of pressure you are using on the 4K. Generally when the razor does not pass the thumbnail test then the bevel has not been properly formed....