I suppose i'm lucky... My diffs have always been good!
It's only when i'm bad with the grease and rebuild that the diff slips. Then it's time for new balls and rings. But the nut has always been okay.. better when it's new.
I use a little threadlock too.
As for the camber.. i used to run 2 deg and found it a little much. The car doesn't really roll that much for the full 2 deg to have effect. And furthermore, the car doesn't spend much time at full sideway load either!!.
I normall run 1 or 1.5 deg now.. usually just 1.
Pm'ed ya back!