I've barched basically every TH up to 10 and the key is to use rage spells when needed. Both heroes up, you shouldn't need any. 1 hero, you might need one rage. Both down, depending on the defensive levels 0-2 rage spells. As long as you don't use more than two your spells should cook faster than troops at TH 9 and 10. I cook three rage spells before farming and cook as many rage spells as needed after each attack.

