Basically there are a few key combinations that you need for Tie Advanced to be effective.
TA + Biggs: Obviously a good combination. Unavoidable target locks when Vader shoots gives Biggs protection and taunt. Plus, when a target lock refreshes thanks to TA, it counts as a new one for Biggs.
TA + Scimitar: Hiding TA behind stealth is the most effective way of protecting him.
TA + Reaper: Reaper can give TA more protection, and slow down enemies.
TA + Slave 1/Umbaran: The combo is the same with either ship. Get 4 enemies target locked, then aim at the last one with Proton Torpedoes or Umbaran Missile Pods. It is not unusual for these two attacks alone to clear the entire enemy team.
TA + Gauntlet: Gauntlet is just fantastic for all Empire ships. It makes them faster and a lot tankier.
