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IME fins or burrs tend to break or tear off regardless of how they're removed requiring going down to 8k or so anyway. A light bread knife, on a stone, piece of wood, or fingernail is probably as...

This ^ is good advice.

I suspect that you are producing a fin with your higher grit finishers that subsequently breaks down. This is easy to do with slow naturals or by using too much pressure...

I don't know what is happening to your finished edge, but you can go back to the 8k without doing anything.

Is this happening on more than one razor? All of your razors?