Maybe a Formation upgrade could work for imperials. Imperials have 1 TIE Formation slot and for the most part it effects TIEs.
Example, Pursuit formation. When one of your TIEs attack a ship with another friendly TIE once per round you may reroll one of the defenders die. 3 points.
Or
Form up, When attacking if of your TIE has two other friendly TIEs in range 1 roll 1 additional attack die. 4 points.
double sided maybe?
TIE Fighter close formation:
when at range 1 of 1 or more other friendly TIE fighters, if an enemy ship declares an attack against a ship in formation, they must target the ship with the lowest pilot skill if able. After a ship in formation executes a manoeuvre you may flip all TIE Fighter formation cards over.
TIE Fighter pursuit formation:
when attacking a ship, if you are outside it's firing arc, you may change all of your focus results to hit results. After a ship in formation executes a manoeuvre you may flip all TIE Fighter formation cards over.