Luke w/ R2-D2, Lone Wolf, Shield Upgrade
Bigs w/ R2-F2, Stealth Device
Tarn w/ R7 Astromech, Stealth Device
The idea being, take the 2 toughest x-wings to kill, Luke and Tarn, then throw in Biggs to bodyguard them for a turn or two. This list is proving suprisingly tough to kill.
Once Biggs dies just split up the other 2 x-wings and see which one your opponent tries to go after. Neither one is a fun choice.