The most effective Barching composition with wb comes from putting 4 wb and fill with barbs in 1st and 2nd barracks, then all arch in the 3rd and 4th barrack, this tends to give slightly more archers than barbs but not completely outweighing the barbs, 10 wall breakers probably takes up a bit too much troop space for a th7, considering the bases which you will tend to raid as a th7



