I am working on an article right now on betting NFL totals in September, and right off the bat without digging deep, blindly playng certain Unders looks promising.
First off, in ALL games since 1985, the Under is 617-518-16, 54.4% in the month of September.
Secondly, in September Division games since 1985, the Under is 257-236-7, 52.1%.
So, with some quick math, playing the Under in all non-division September games would have put you at 360-282-9, 56.1%, +49.8 units. Hmmm.