I played in a tourney last weekend, went 2-1 and flew a three rebel squad. One of my wins was against a 7 Tie Swarm, losing only 1 ship to his 7.
I was very happy with the performance and enjoyed flying it a lot. With three ships, you end up taking the fight into the asteroids a lot which is a ton of fun.
Luke Skywalker - Proton Torp
Horton Salm - Proton Torp, Ion Cannon Turret, R5 astromech
Tycho Celchu - Concussion Missiles, Push the Limits
The secondary weapons are key on this list, I always took out one enemy ship at the Range 3 initial volley before it even got a shot off. Luke's Proton is kinda mey, but Horton and Tycho have good abilities that enable them to hit hard with the secondaries.