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Well, call me a lazy lapper then.;)
I only lap a Coticule when it becomes visibly out of true (I eyeball them), or if the results start degrading. I too lap on a DMT-C.
I do focus on the high...

All right,

let's make you an offer you can't refuse.:D

You go ahead and buy a Norton 4K/8K, or perhaps even better, two of those Naniwa Superstones in the same grit range that they sell at SRD....