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   I have polished a foyer of black marble and after 3000 diamond pads on a 17" floor buffer I need a little higher sheen....Is there a higher grit diamond pad that I need to use...After the 3000 pad I used a crytalizer with #0 steel wool pad but still don't have the shine that the tiles on the walls have..Do I need more weight on the buffer?It is about 80-90 lbs. thanks..