I did a Brembo swap using Hawk HPS pads on my car. No issues with noise at all. Did you use a good lubricant between the back of the pad and the shim? As well as between the shim and the piston? And where the pad back slides on the caliper? Think most of the noise is from the shim. Every time someone complains to me about noise I use Permatex Ceramic Extreme brake lubricant like described above and the noise is gone. And I don't have them saying the noise comes back. The stuff works well and is good for 2800*F as well.
They sell it in the small packets as well as larger containers.
where's the best place to buy the stuff?