Many people think that the Rebel Y-wing needs the R2 unit but I prefer the PS boost.

Grey Squadron Pilot, BTL-4, Ion Cannon Turret x 4

I like the simplicity of it and it should be up there with BBBB in terms of effectiveness.

For those who like a more pure damage approach

Grey Squadron Pilot, BTL-4, Blaster Turret, R2 Astromech x 4

The danger here is getting bumped and not focusing.

Imo, at least one ion Y should be kept title-less

They might not be the hardest ships to draw arcs with, but they sure as hell aren't the easiest. On the flip side, no ship has any problems whatsoever drawing "arcs" with a turret, or on an Ionized target.