Fighters are already limited in that they can only move OR shoot if they don't have a squadron command. Makes them difficult to use unless closely supported by a command ship. On top of that, if you wipe out the ships, it doesn't matter how many fighters are left on the table, the only thing that scores are the ships.
Now we have the Raider which will be devastating to the squadrons that do come into play. 2 of these can potentially wipe the table from fighters in a single round of combat.
What needs to happen is the Rebellion needs a new admiral that gives some bonus to fighters. For instance, maybe ships can issue squadron commands at long range. That might keep fighters in the battle.