My rear brakes (non S) are squealing under light braking and sometimes hard braking too.  Had the dealer check it out and there's 65% left on the pad.  They also said the squealing is normal.  Dealer default answer.  Well this weekend it was squealing so bad it sounded like a bus. 

   Yesterday I remove the pads and calipers and cleaned everything out with brake cleaner, used caliper grease on all metal contacting parts, and put a little Permatex brake quite paste on pad backing plate.  
I thought for sure this would solve the problem but once the brakes warmed up they started squeaking again.  Does Porsche sell anti-squeal shims for the base model boxster?  Any suggestions would be greatly appreciated.
Oh yeah also noticed the inside pads were not being compressed by the inside caliper pistons when I was removing the pads.  There was a slight gap.  Is that normal?