When I swapped my Firepower after a lengthy time out of the cabinet, it was bowed similarly, I put weight on it trying to bow it back the right way. Didn't notice much change. In the end, I put all the mechs on and put it in the cabinet where it is supported by the sides...now I can't notice or measure any bow. If it was bowed the other way I would be much more concerned. I'm thinking after 30+ years, these games want to be in their "natural" state...