I'm probably not the person to weigh in on this since distance keeps me from making many games, but do you/can you offer second-half or post-game delivery? Or at least offer a pickup site walking distance to the tailgates? The tailgate I was at Saturday had food brought in after the game, so whoever had their business basically got extra business because of the kick-off time. Probably half the normal spread for breakfast since a lot of people didn't spend much time at the tailgate before the game, but then the normal spread for after the game.
It seems like there would be plenty of people wanting to hang out after an 11am game, eat, and watch tv (or at least there would be after 11am games where we don't **** the bed). But I think offering a way to get it to the tailgate sometime in the second half is key; I don't think people want to pick up lunch food before the game and have it sit at the tailgate for 5 hours before they break into it. If you offer second half delivery and people aren't taking advantage of it, then I'm stumped.