As many have said these types of packs are about more then fixing ships, adding variety is just as important and that is something the Y desperately needs.
Y-Wings can take turrets, or not. If they take turrets, they can BTL, or not. They can take munitions, or not. They can take bombs, or not. They have the most variety in the game.
HWKs MUST take turrets. They then cost too much to take anything else. You build your list around the HWK or you don't bring the HWK. Fix them and you fix them in 2 factions.
E-Wings cost too much to add anything ever. Except Corran.
X-Wing is already fixed by IA, and already has the most pilots, nothing else needed.
Z-95 could use more pilots but they're not in a bad spot as-is.