Since when is the Nerf bat the preferred method of game balance. These threads used to be about what needs to be added to the game, not what needs to be taken away!
All these issues can also be solved by adding new elements to the game. How about faction specific upgrades that narrow the the roles of the Flotillas, preferably at a cost.
Offensive retrofits
Rebels: Reduce Squadron value by 1 or 2, to increase the range of fleet support upgrades by 1 to a maximum of 5.
Imperial: When attacking, spend a scatter token to add a die set to an accuracy to your dice pool.
Basically we need more upgrades that solve issues within the game, but come with a price, beyond point value.