HELP!! Sugestions needed!

I have a 2001 GT. I recently got Brembo front rotors, vented and slotted. They were great for the first coupla weeks. Then they started squealing. Then they started screeching...worse than nails on a chalkboard! When I put on the new rotors I also changed out the brake pads with new stock ones. I've tried using brake grease. When that didn't work, I tried spraying brake cleaner. That works but only temporarily.

I have done a little searching to see what I could find, and unfortunately it was on an import site, but they were having the same problem I am. Any othe suggestions what I can do to permanently fix this problem...it's annoying and extremely embarrassing!