So I'm getting ready for a tournament and I'm feeling pretty good about a four pilot rebel list:

Blue Squadron Pilot

Wedge

Biggs+ R2F2

Rookie

I was weighing the benefits of swapping R2F2 with an ion cannon on the BSP. Any optimization advice is appreciated!

If you have it i would go for AdvS on the Blue squadron (not R2F2 or Ion) but that's just what i would do.

I ran the squad and it was a very close victory but R2F2 didn't really help (although no evades on six rolls was disappointing!). I would like to get the AdvS but before I do I am going to try swarm tactics on Wedge.

Swap R2F2 with anything and you'll likely come out ahead. In this squad Wedge is moderately more dangerous than everything else but there really isn't much reason to put that Astromech on Biggs. Everyone in that squad attacks with 3 primaries so there is no prime target except Wedge and his agility negation.

Thoughts:

Use Luke instead

ADS on Blue

Ion on Blue (could be very helpful against some squadrons although it is situational)

Swarm Tactics on Wedge +1 point somewhere else (maybe Garven for Biggs or turn the Rookie into a Blue)

Switch to PS 4 ships besides Wedge.

The BXXX core is solid in part because all the ships are 3 dice threats that aren't too easy to take down.