You want Charlottesville to lose (vs Louisa) AND Harrisonburg to lose (vs Turner Ashby) and 2 of these 3 teams to lose: Heritage, Champe, or Pulaski. Luckily for you, I think Charlottesville will lose so you'll move to number 14, and Pulaski will probably lose to Salem, but that might not move them out of the top 12, and if it does, you'll still be behind them.
Well shoot. Charlottesville and Pulaski will have tough matchups for sure, but the others should all be well favored in their games.
Heritage (6-3) @ Loudoun County (3-6)
John Champe (6-3) vs. Freedom (4-5)
Harrisonburg (6-3) vs. Turner Ashby (5-4)