I just had the same problems with my brakes this past weekend. After some long distance and hard driving, the brakes began to squeal like fingernails on a chalkboard. Brought to a local shop, they said that everything was still new(@8000mi); but the rotors were inferior. I'm looking into switching to the Wilwood or Prodrive
Big Brake Kit. Stoptechs are tested to be the best but BANK.