From granite polishing powders i only used mb20 but marble polishing powder mb12 gave me better, more natural results. Not great but at least better than competition which crystallized their sample and it looked like plastic.
The process i used, was that I densified after 200 resins, hone all way up to 1500 and polish with mb12 wet to dry. Customer however was already satisfied and approved sample that was honed to 800grit only. As of now i am waiting for their approval of my revised quote and will see what happens. I'm not sure if i should look forward to that though.

 
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