I agree with Jkeifer, it's most likely a biasing problem.
One SS amp running hotter that the other,. . .
should I be concerned? I have a pair of Classe CA301's that I bought at seperate times. I'm not running them in bridged mode. One seems to be quite a bit hotter than the other. Hot enough that you can't leave your hand on it for more than a few seconds. The other one is just very warm although not enough that you feel you have to pull your hand away.