I need advice on polishing carrera marble counters. I have been practicing with mb stone ultra turbo 4 inch pads, 50 grit-1800 grit. Then stone pro emp powder polish. I'm having problems with the edges. Everything looks good except along the edge where I stop the machine. I'm using a makita variable speed polisher. The final edge still looks dull and scratched. What technique can I use to eliminate this problem? Any suggestions would be greatly appreciated. Thanks.