Ok, I think the these shims made from roofing zinc strips should do the job. I fitted them and then glued them in the carrier with some IC2000 rubberized ca and I don't think they will ever break loose on their own and the small bit of space the ca took up tightened up the fit to where I'm confident the bearings won't ever wallow out their seat and start moving on me.

I left the shims a little high to make it easier to get the bearings in and I don't think it will interfere with anything. Now I just have to do the other three wheels and I should be golden. :)

By the way, this lst diff and xxl cvd setup even sounds better than the stock parts

Heres a few pics for reference in case anyone else is ever looking to use the rdracing carriers with xxl cvd's.