Cool! Hope it fixes issues. I don't really think it has anything much to do with loads across rails, but rather, it is likely just down to simple quality control. Lesser known names simply don't have the same level of quality as, for instance, a Corsair or OCZ would have.
11.5V is not so drastic that I can sit here and tell you: "Yes it will definitely be fixed." so that's why I recommended using another known-well psu to test, if possible. It definitely can be the cause though, and even momentarily dropping lower than even shown in the on-screen real-time report.
But once you do fix it, regardless of how, it will be so worth not having to think about the issue any longer and just use the machine as intended. Best of luck!