Just in the spirit of being thorough: try changing your braking method on descents. Bike rotors have a relatively small thermal mass and you should use the same method as cars when descending a mountain: don't drag the brakes, brake hard at times when you can, and let the brakes cool the other times.

A car known for it's ninny brakes, the Prius, even has hill descent mode for this reason. It drags the gas engine to help provide additional friction and prevent too much speed gain on descents. It can do this because it can circulate coolant to then shed the generated heat.

Since you don't have an extra method to wick away heat, you have to be sure to let the brakes cool since the rotors are not vented.

Yes they are cross-drilled, but not vented like a car, which has 2 flat surfaces and cooling vanes between. This is one reason why car brakes are so good, surface area. They're even taking this farther and farther:



So happy braking!