I forgot to mention that I have the same issue with two different sets of torsion bars so It's not a weak bar on my problem.....it's a clocking issue.
I would think it would take a lot to weaken one of these bars....they are built with quality steel and really don't take as much load as they are designed to handle.
that being said I also know anything can happen.
Good luck and let see what happens.
Mop