In the same boat, I have HC+ and new RDA rotors all round. Loudest squeel I have heard from any brakes to date! At first I also thought there was something wrong like brake shims, not bled properly etc but i have gone back over these things and they seem fine, I'am also hearing from multiple people (including this thread) that they are just a very noisy pad....on the upside they do work quite well!
Ryan