That Southrons will not work. You have to think out.
A) Do I want to "swarm" with ambush guys and then hit enemy with the Whrling Strikes? Or Red Wraths?
B) Big "Bomb" Southron minion will not do its work. Southrons missing wound protection from sets 8 and 10 (
High Vantage and/or Line of Defence). You have to use Traveler, who protects and have ambush.
My advice? Use manny ambush minions as you can, add ambush bows. That Two southrons from set 7 what pump other southrons for twilight. Consider using conditions like Strenght in Numbers and Wilderness. Be a swarmy little southron army with clever using Red Wraths ad
Bold Men and Grim at sites with threats. Add exerting southrons from TT and Vanderer (assign to Ring Bearer or add 4 to prevent it).