Yup, to sum it all up:
if you have a RR carrier and your wheel backspacing doesn't allow you set the carrier so that it pulls the tire itself up against the frame of the carrier because of the bumpstop brackets hitting your wheel- you can flip them and redrill them so they will clear your rim and you can get the tire pulled up tight.
simple fix that RR *should* have done to begin with by making the bracket mount either way, or simply make the bracket 3/8" shorter - sure you'd lose 3/8" of "adjustability" but it would at least work.
The tire mounting bracket itself is minimal, thin sheetmetal and barely up to the task of holding the spare at all, let alone floating in mid air.
If you pull the tire up to the frame, it distributes the load over the carrier mount and the carrier frame to get rid of the wiggle.
If your tire has been mounted "hanging" without touching the frame and shaking for very long - take a good look at the tire mounting plate, the metal will fatigue and crack.
Also the lugs they use are pretty much shit.
I don't know if they are actually the wrong size and there's enough slop in the threads that the tire wiggle strips them, or if the metal in them is just that soft, but obviously they blow.
It's a PITA to grind the spot weld out on the back of the plate so you can knock them out and change them, but it can definitely be done.
After I changed Justin's out to some "real" lugs, hist lug nuts still fit just fine, the threads in the nuts hadn't taken any damage at all - so its probably just really soft steel in the RR lugs.
here's some pics of the metal fatigue/cracks - ended up finding another crack on the plate while working on it.
For now, I welded up the cracks while I was welding in the new lugs.
With the tire pulled up tight to the frame, it should hold up but if it doesn't then its a pretty simple deal to get some 3/16 plate and make a replacement for that piece.