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Thanx for the explanation Euclid.
A good Jnat works just fine when lapped with a diamond plate so that leads me to think that some of these stones may not be as fine as believed so the extra...

Just curious. Why do you need to go to all this trouble if the stone is actually a fine grit finisher ?

You seem very focused on the finish of the bevel.
Under a low power loupe your 8k "mirror" finish will reveal scratches & even a 30 k Shapton will leave scratches. It is the nature of stones to...

Nope not necessarily you. The coti may simply not be up to the task.

I assume you've tried the coti with water only after the 8k ?