Henry,
Not sure of your skills, you may have already checked this out. I would check to be sure you don't have a dragging caliper that may have caused rotor overheating and warpage.

I assume new brake pads were installed along with the rotors? If so, when the pistons were pushed back into the calipers, it's possible something may have happened that is now causing them to hang up and ride the rotor too tightly. Just a possibility worth investigating.

Lou