Rear Disc conversion super noisy?

Are they floating type of calipers? If not than I would think the Rotor is not centered in the caliper and when you are pressing on the brakes lightly only 1 side of the pad is touching the rotor, when you stomp on the pedal hard then both pads hit the rotor and the noise is LESS loud? Maybe the mounting brackets are on backwards? The Bearing issue I mentioned above?

Just throwing out Ideas, I am about to buy the same set up for mine.