Add more Shards, or drop the one copy at all. I would say adding more, opens options to add more companions. That way you have an easy heal later during the game.
Derufin has it's place, since he can be a lifesaver. If you're planning on just surviving, less winning, I would add some events rather than
Noble Leaders and focus on healing.
Boromir, LoG is a good addition since he needs to be trippled. Also you could add
Last Throw, you can see whether it works out, otherwise just stack him.
Shadow, rather have
Desert Lord than that other minion. If you want cheap and still an exertion, there is a cheaper dude. 8 won't win you the skirmish.
Focus on wounding more I think than winning skirmishes. Lurtz's battlecry can
be gone, as 1
ferocity. It should be a surprise, when the other person is off guard. Again, rather add more option to wound.
CbtR and
Gollum DaD build up threats and wound the ringbearer, never bad in a wounding deck.