As said before, I think if your ships don't have Crack Shot or Howlrunner....you should have SOMETHING in your list that can shoot more than 2 dice. Having some ships with a higher attack value can help strip the tokens and allow your lighter fighters to get their shots through on Stealth Soontir. He's really the gold standard to defeat.
I think the advent of the super cheap tank has relegated 2 dice primary attack ships to the filler pile. Since Wave 7 we've seen the K-wing, Punisher, U-Boat, Ghost (relatively speaking it's quite cheap), and with Wave 9 coming, we're going to see the ARC-170.
You know....I always felt that lots of cheap attackers was the bane of things like U-boats or the Ghost. The 3 green dice with a Focus can ruin the ordnance shot of U-boats or the heavy shot of the Ghost. Sure, you can blank out and die in one shot, but on average 1 Proton Torpedo w/ TL and GC only does 2.2 damage vs. 3 Agility w/ Focus. So, it takes 2 Proton Torpedoes to kill 1 Tie Fighter on average. That means they can kill 3 Tie Fighters if U-boats get to fire all their Proton Torpedoes.