Rattling brake pads

[Plaz]

So, I thought it was my UUC swaybar endlinks again, but I replaced those with the MUCH better upgraded ones... and the rattling remained.

I finally figured out that it is my rear brakes that are driving me slowly insane with their noise... the rattling disappears when I put even a tiny bit of pressure on the pedal.

I lifted the back of the car tonight, took off a wheel, and figured out exactly what's rattling... the inside pads. They've got just enough wiggle room to make a racket. The hex bolts that hold the caliper are torqued just about as tight as I could get them with the leverage a regular socket wrench can provide.

So know the question I'm trying to answer is, did I do something wrong installing the pads, or is it just a case of poor fitment? They're Hawk ceramic pads.

Anyone have any idea of ways to address this? Or is the only answer to put other pads on?