Are you cabbing, or faceting? A good cabber can do precision work, producing a uniform, smooth, and perfectly polished cabochon.
Anything with flat faces is typically going to be done on a flat lap or faceting machine. One can polish flats with a cab machine, but it's really meant for cutting and polishing curves.
Try posting in the "Lapidary Corner: Colored Stones" forum, it's where the cutters hang out.
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