I'm looking for a bonded diamond/CBN stone to replace the coarse DMT in my sharpening progression. I like a coarse DMT very much, but I really wish it maintained it's initial aggression. I've tried using various extra coarse diamond plates, but I dislike the larger sized particles. I sharpen stone in hand, and I like to be able to see the when the apex contacts the stone. Diamond plates with abrasives under 325 grit don't give me as crisp a visual. So I'm looking for a bonded diamond/cbn stone in the 300-400 grit range. Any suggestions?