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I'd agree with that description of the 2 stones. I think the 8 may be slightly softer than the 5.
The 12 or in your case the 15k seems softer again but doesn't quite have the 'gummy' feel of the...

You've obviously used the stones a lot with knives. Maybe you're just finding your feet with them on razors ?
I remember a thread where guys noticed the 12k had some rough spots. I had noticed...

No problemo.
So do you find the swarf build up trick smoothes the edge or the bevel polish. I do tend to clean the stone rather than hone over swarf with razors but I have minimal knife...

I've got both & found I lapped my pros a lot less than the GS when used solely on razors. I would say the pros 'seem' harder but even within the one line there are variations e.g. the 1k pro is...