[Neil]

I don't understand why they're getting so hot? You said the REARS are warping? The rears don't do that much of your braking. I would guess that since it's heat that warps your rotors, and you shouldn't have THAT much heat, you must have a caliper pin hanging up or something. I would recommend lubing your caliper pins that the caliper "floats" on. I just don't think you should be getting that much heat back there unless you are driving around with one foot on the brake as hard as the other foot is on the gas.

Hope that makes sense. Good luck.