What's wrong with a few big fleets? my defense fleet is usually about 150 fleet supply in size with a Jedi Venator and a couple Venator cruisers + support. Don't need a really big fleet, since I don't want to scare them off. I want to draw them into the defenses, let the mines soften them up and then engage at speed while they try to retreat. My assault fleet(s) is a bit larger typically another Jedi Venator and 4 Venator cruisers, couple Acclamators, and Dreadnaughts in close formation to support each other. Used to bring Invincible heavy corvettes, but I go heavier on fighters than bombers so we can usually clear the skies without them.