thats the thing though, since they only need range3 (even w/o secondary weapons since all i got is 1 dice if you fire normally anyway) then slowing them down doesnt really help. The moment your huge ship can do anything at all (except for the random STL for range5 shooting) theres something close enough to targetlock and fire back, completely ignoring the 4-5 ships you have in the way.
Actually, I think having small based ships that can use Ion Torpedoes to be key. So, for the Imperials, that means Tie Bombers. The Rebels have a dirth of ships that can fire Torpedoes. Of course, the Imperials can start to use Assault Missiles.
The idea is to slow down squads of small based ships so that the snub nosed fighters can get in close and dish out some damage. Tie Interceptors and X-wings are key here.
But ion torps dont stop actions or shooting. True it may mess up their angle but against a huge ship base thats unlikely unless they werent facing towards it even remotely. If they cant hit your huge ship, either they get one hell of a defensive boost against anything it can throw out or it cant do anything either. Most of the supporting qualities are range1-2 too, with a few being 1-3.