Rhineland defectors demonstrate how to deal with capital ships
I think we need some better anti-destroyer weapons, and I think some sort of torpedo for fighters could be a solution.
It would be weaker version of EM torp with smaller blast radius, but faster (possibly with very slight homing).
Suggested stats (at T5):
Damage: 10000 (slightly better than firestorm or cruise missile, worse than doomday or EM Torp)
Blast: 200 (better than doomsday and most fighter missiles, same as firestorm and cruise, worse than EM)
Manuvour: 10d/s (worse than any other guided missile)
Range: 7000 (better than most fighter missiles, worse than cruise or EM torp)
Recharge: 7s (worse than most fighter missiles, better than firestorm, doomsday, cruise, or EM torp
Reload: 140s (worse than any other missile)
Lower tiers would obviously be scaled accordingly.
I think those would be reasonably balanced. It gives it a special niche (very good against slow-moving targets, i.e. destroyers) but all the other missile types should still have their own uses (EM and doomsday are more powerful, EM and cruise have better range, EM has bigger blast, all other homing missiles have better homing, standard fighter missiles have larger cassette and faster loading times).