I am in the same boat, after recently deciding to embrace the dark side and start flying for the closest thing we have to a proper sith fleet. I've got a few lists I am working on, all built around the theme of at least 2 tie defenders. Any feedback on them would be appreciated, as I feel the defender may be a bit of a sleeper ship.
List 1, spooky ghosts
Whisper-veteran instincts, fire control system, advanced cloaking device
2x Delta Squadron Pilots
I like this list a lot. It can hit hard, and has good survivability. The only reason I don't think I will run it is because of the threat Han Solo, and to a lesser extent all falcons and firesprays pose to it. Solo is pretty common in my local meta, and if my list can beat up 80% of my opponents, but loses fast to the other 20, it is a bad list. Something something Solo OP somethingsomethingsomething ffg please nerf.
List 2, Rat Squadron
3x Delta Squadron Pilots with Ion Cannons
I think this capitalizes on the defender's ability to get behind people. You play like a rat. Never directly engaging, just making quick strafing runs to ion ships before k-turning behind them to finish them off. I think in a dogfight situation, this list could be absolutely brutal, especially in a long game. However, tournament games are short, and I am sure someone can find a way to slow play even against a list that ions most of their fleet. It also doesn't have any way of doing sudden damage bursts beyond flying into range 1.
Alternative: Put proton rockets on all the defenders.
List 3, Fett's Jets
2x Delta Squadron Pilot
Boba Fett with Adrenaline Rush or Veteran Instincts
I know Fett isn't all that popular, but I think his maneuver option is fantastic The Firespray plays really well with defenders, and this list can really put on the hurt with its' strafing runs. Fett with VI can let me bank after I have seen where everyone else is going, but adrenaline rush can let me do a k-turn to come back around with no penalty one turn.
Alternative: Drop Fett for a regular Bounty Hunter and put the Ion Cannons back on the Deltas.