Here's what I'm thinking of as a counter to Chewie, though not sure of it'd
work:
Sigma Sq. Phantom w/ Adv. Sensors & Stygium Cloak
Omicron Shuttle with HLC & Adv. Sensors
Brath w/ Decoy (if I can use it) or Swarm Tactics
Brath would then stick with the shuttle, shooting as late as possible to maximize the effect of his pilot ability. We'll see how great Chewie is when he's piloting a 2 attack, 0 Agility boat that can't take a turn without stressing himself!