Well...sometimes typing out your problem, gives you a clue. 🙂 I had checked custom CSS and code injection to make sure no new code appeared from the upgrade, but as I typed "page" up top a couple of times, I realized I should check the individual page custom code area. Sure enough, when doing the upgrade, this code was added to the Page settings >advanced section. I 100% didn't have this code there prior, as the pages were full width in 7.0
Adding this info here in case someone else comes across this when they use the built-in upgrade feature.