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I see... it does sound like some diamonds became dislodged. I'd say you got a bunk stone (it happens), as the DMT 8C is no wimp when it comes to use, they can take some punishment ie pressure. Try...

DMT (and SRP, too) recommends breaking in the lapping plate before using it. Sometimes there are high diamond spots, which will scratch up the hones you are trying to lap. Take a screwdriver shank...