Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
All of the heat is being generated, from stopping the bike. 200 kg, + you, from some speed, is quite a few KiloWatts of energy.
I'm pretty sure the issue is the heating of the brake fluid. That comes from the pads, through the pistons, to the caliper, and from there into the fluid itself. Better quality fluid should slow the rate of degradation, and let your brakes work as designed, longer.
You may be able to purchase pads that have more grip, so you use them less for each stoppie. If there were an insulator between the pistons and the pads, that would slow the heat transfer significantly.
The whole reason sport bikes have two disc brake systems on the front wheel is to shed more heat, due to the greater surface area. A single disc system can be just as powerful.... but it will overheat more quickly.