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I never had problems with Super Stones swelling or not being flat enough.

Heh... yeah, a typo, sorry 'bout that. Fixed now.

In my honing adventures, the 8k Norton and 8k Super Stone did not bring a blade to the same place. In fact I used the 8k Naniwa to finish after the 8k Norton until I got a 12k.
I'm not certain...

I had both - the Norton 8k is (gritwise) seemed to be more like a Naniwas SS 5k (I had one of those to compare to).
The Norton 8k seemed 'gummy' feeling in use.. the 4k was 'gritty' feeling. I...