Not sure about this list but it may work

Rexler

Darth with Swarm Tactics and X1(not sure what to choose possibly AC)

Alpha with Autothrusters

AP

So there are 2 ideas the first one being which ship would be fired at first? Probably the Alpha but he may be hardish to hit. But Rex is a big hitter to but naked and Darth is good support but not a heavy hitter. I do see the AP being shot at last,

Second is hopefully Darth and another ship (hopefully Alpha)will fire before rex possibly allowing him to crit.

I think subbing Rexler for Vessery, as he will mesh really well with Vader. This frees up 2 points, which can get you ATC on vader, and 1 more point left over.

With swarm tactics going, that would still let vessery shoot first with focus+TL, then vader follows up with a focused attack:

6% chance for just ATC crit

38% for 1 hit + ATC crit

56% for 2 hits + ATC crit