I ran 10 test games and won 7 of them, usually by 7-10 points, but it's an all-run offense. All it takes is a few gains of 2 yards instead of 3 to change the game. Losing by 4 isn't much of a stretch, although I haven't really gone through the box yet. Have you? Are there any particular plays that look screwy?
On an ironic note, I lost my playoff game to Benedict partially because of my crappy punter, who liked to shank them from inside my own red zone. Now that I've cut him, my kicker is doing the punting, and because out-of-position penalties are turned off, he's doing great.