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It wasn't a problem .... but it did create swarf, not steel, in the water fairly quickly.

When I had it I really liked the naniwa 12k. I would probably have kept it but I was selling them as a set. The Shapton 12k was real good too. It did that auto slurry thing so I guess it is pretty...

I wonder if pressure could have something to do with that ? Or possibly grit carried over from the coarser stones to the 12k ? I'm anal about cleaning the blade before going to the next grit, and...

It is sort of impossible to tell without seeing/feeling the razor. From your description I would think it is a matter of honing technique. You've got 70 round trips with the 8k and then go to the 12k...