Not a bad list by any means.
Howlrunner (one of the Tie/ln expansion pilots) is a great choice for a swarm like your list. Her force multiplier style special ability is better the more wingmen she has to buff.
Backstabber is always good.
Mauler Mithel is great but he's a bit expensive when you're trying to go for quantity and his ability is only useful to himself.
Vader is bonkers good all the time.
Marksmanship is wicked good as well. Particularly in conjunction with missiles.
Dark Curse is interesting for his points. Being immune to torpedoes, locks, and offensive focus might be one of the best abilities in the game.
I'm not a big fan of Maarek Stele. Vader seems better for the same ball park price.
I'm not sold on swarm tactics. Since it only effects the shooting phase, it doesn't do enough for my liking. Sure, you get to shoot on the turn you die, but you don't get to chose your action after the opponent - hence you cannot use barrel roll after you see their maneuver.