Might I make a suggestion.
Increase airflow over the rotors. 2 possibilities, either ditch the "dust" shields, or if you want to keep them I have seen someone get 2 small 45% 2" elbows from the muffler shop, and they drilled corresponding holes in the dust shield, and welded the elbows onto the "dust retaining shields" with the other end facing forward, so the non welded elbow is literally scooping and forcing air against the backside of the rotor.....