I like
Field of the Fallen too, but I don't have a single copy of
Seasoned Leader. :-)
Cast Unto the Winds is actually one of my favourite cards in the deck, because it forces my opponent to kill all of my minions or risk losing somebody important in Regroup. This deck generates a lot of twilight, so I usually have enough to use CUoW at least a couple of times.
I don't know if I can cut the Southron Travelers. I have to play a lot of wounding decks in my meta (with the Rohan/hobbit variety being perhaps the most annoying), and so there are a lot of games where I wish I'd pack more Travelers, rather than less.
Southron Savage would require an entirely different deck, as hrcho astutely noted.
I've only got two copies of
Mumak Chieftain, or else I would be using four.
Imrahil with a
Knight's mount provides knights with some badly needed damage bonuses. He allows me to kill minions without having to burn forts. I like
Ingold, but
Turgon's maneuver wounding is too good to pass up. He and
Alcarin both combo with
Fifth Level (as my only fort that transfers in maneuver), and once
Alcarin has
Armor I can use the "assign to heal" trick to foil minions with large damage bonuses.
Men of Numenor is partially swarm protection, partially corsair-hate. It gives me the freedom to kill any minion on the board when combined with
Fourth Level, and it allows me to kill the
Castamir even if my bows get discarded.
Stone Tower would be a good addition, but I'm not likely to ever face an enduring nazgul deck in my meta (I own the only one). I am likely to see a lot of Besiegers, Corsairs and Captain Crunch.