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If I had a USB microscope, I would try to figure it out & display it in photos. :shrug:

To me the high lighted portion of your reply, says it for me. I feel a 1200 would leave a less damaged surface than a 325.
Plus, I always wanted a 1200, now I an excuse for getting it. :D

I did not lap my 220, I don't set bevels with it, I only use it for rough repair jobs. I did lap my 1000, 4/8 : I don't own a Naniwa 12K, so I will not comment. I finish my lapped stones with a few...