Doug, did you add the sticky anti-squeal compound to the back of the pad? I did, I don't have any rattle. The pads should be stuck to the caliper / piston like the stocks which would prevent any vibration or rattles.
After running the Carbotech AX6's for a while, they're still working very well.
One minor nit has cropped up, though. They rattle a bit. They didn't do this at first, so I'm not sure why. Also they tend to rattle simply because the rotor is turning under them - at certain speeds they continuously rattle about 10X a second. Weird.