Aceton Assimilators only damage out to 5 km range. Beyond that, just park and torp them to death.
Now the really nice one is for the Heavy Escort carrier
, the Torpedo Point Defense system
is very nice. If you have a bunch of fighters picking away at you, you volley this and they just vanish. Pity about the 3 minute recharge time. Add in stuff to increase torp damage and other boosts, you then charge through an enemy fleet, and make them hurt.