Swarm of 6 at 199pt. I am probably not the first to think of it, but here it is:
"Howlrunner" (40)Swarm Tactics (3)
"Scourge" Skutu (32)Swarm Tactics (3)
Seyn Marana (30) Marksmanship (1)
Gideon Hask (30)
Del Meeko (30)
"Wampa" (30)
View in Yet Another Squad Builder
All I need to do is to get a ship below IN5 (or shooting after me at least) to be in the bullseye of Seyn Marana (IN5 b/c of swarm tactics), who will guaranteedly deal a face down damage card and damage this attacker. Wampa gets an IN5 shot, too, using his ability to attack with 3 dice. Gideon attacks with 3 dice. Scourge gets maybe 3 if he has the bullseye, too. And Meeko provides defensive bonus for all against that damaged ship.
I'm not sure whether those three 3dice attacks are better than 1.5 more TIEs.