Shot in the dark…. Did you run some sessions with traction control and/or AdvanceTrak engaged? Heavy rear pad wear could be from those systems applying lots of rear brake.Could I ask what difference you felt running R16/R10 vs R16/R12?
My (Carbotech equivalent) rear pads wore out so much faster than my fronts, so I'm investigating the forum to see if I need to bump it up from 10 to 12, or if that'll even have any effect on it lol