So I have been messing with a 4 ship rebel list.
Started with two rookie X-wings, a dorsal turret y and a Lothal rebel. It was okay but it was having problems hitting 3 agility ships like protectorates. So I switched it up and I have been having a lot of fun running this
Lothal Rebel
-FCS, Chopper
Rookie X-wing
-Targeting astromech, integrated Astromech
Jess Pava
-R4-D6, Integrated Astro
Captain Rex.
Yes, I am using targeting astro because frankly against high agility lists, you are K-turning a lot. This helps make the shots count drastically.