I have HPS's and they've never squeaked. Did you replace all the anti-rattle clips?
I put some brake quiet on the rear of the pads and no issues ever.
No, but I shouldn't have to. From talking to people at performance shops, and online its kind of a hit or miss thing whether or not your Hawk pads squeak or not. Kind of like some Terminators have alternator problem while mine does not.
I personnally do not recommend these pads.