With your current setup, how hard is it to lock up the front wheels? I'm just curious if the front brakes are pulling their weight. I can lock up my brakes at will at any speed with just the factory Brembos,decent pads and decent rubber.
Like Mav1c, my rears just don't wear. Since the fronts are supposed to be doing 70% of the braking, the rears shouldn't be wearing or getting THAT hot. I still have this sneaking suspicion that the rears are being asked to do too much because the fronts aren't pulling their weight. Something like the piston sizes being wrong so, your brake balance is WAY off.