Try to avoid hard braking until the pedal firms up (i.e. pads bed in). Before they bed in you're effectively braking with a smaller pad area, and so X heat is going into a smaller surface area of the pads.

If you brake hard, you run the risk of overheating the surface of the pads where they are heavily contacting the rotors, and you may glaze them more easily than with bedded in pads, not to mention that the brakes just won't be as good until the pads bed in.