Maybe I'm crazy, but I was wondering if running just 2 Firesprays would be feasible. I haven't been able to test this thoroughly, but it held up well against 3 X-Wings (Wedge, Garven, Rookie.)
Krassus Trelix: Heavy Cannon, Proximity Mine, Cluster Missiles.
Kath Scarlet: Slave 1, Proton Torpedo, Cluster Missiles, Mercenary Copilot, Deadeye, Seismic Charge.
By the end of the dogfight I had Krassus with 2 pts of hull damage and Scarlet had 1. I was able to take out Wedge with an initial volley from Kath's proton torpedo and Krassus' heavy cannon. Basically the build relies on massive amounts of damage in the very beginning and sending your opponent reeling. I have yet to try it against a YT1300 build but so far I have found X-wings to be the biggest bane to Imp squads.