How did you break in the disc and pads? Sounds to me like you had new discs, went out and mullered them and now they are shot. EBC arent the best discs in the world to start with, certainly wouldnt use them on a regular track day machine. Secondly, if you hadnt heat cycled them correctly to begin with, that could have caused it too. My brakes (EBC discs and DS2500) squealed at first but once I bedded them in right it stopped and have been fine since. Seems like you had the wrong discs for what you are using them for. No discs should die after a couple of track days if used properly.
Get some DBA 2 piece discs, that should help you out