I think you play the starters until the 2nd half. Start the starters on the first drive (offense and defense) of the 2nd half. During the first half start filtering in the positions you are not deep at. In the 2nd half make sure no starters are in the game. If they are still putting a whoopin' on the other team, play the remainders in the 4th quarter. But I don't think you let the 2nd team or 3rd string QB throw a pass. If they put 11 in the box, just run it, and punt it. I think you have to be as boring as you can the second half - midline right, midline left, off tackle right, off tackle left, counter right, counter left, PUNT!