I think the Tie Advance fix was a very well designed one.
And I think thats the way to go for overcosted ships or ships which not perform or being used like intended by design.
So, the combination of granting a discount on a specific 'upgrade class' via title and providing a ship-specific upgrade card in this upgrade class which is very attractive to use but not neccessarily an auto-include might be the way to go for all underperforming ships.
So a similar fix could be applied on the E-Wing: A discount of 2 points for System Upgrades would make the generic pilots more attractive, since thats basically a FCS for free.
Right now, the X-Wing is considered as a bit too squishy, could use a bit more manoeuvrability, is a bit overcosted in general. There is already a palette of astromechs that would fit in to ease the players needs, but of course they come with a price. So it might be the best solution to grant a 2 point discount on astromechs while creating even more viarity of effects. Somebody in this forum already had the idea to grant a 1 point discount on each Astromech, Torpedo and Modification upgrade card, which might be a good solution for the X-Wing.
So lets just take this approach and fix or fine-tune the rest of the ships in X-Wing and just do a little brainstorming:
Tie Fighter : no fix required
Tie Advanced : no fix required
Tie Bomber: Discount of 4 points on one piece of ordnance or 1 point on every upgrade; "Tie Shuttle" special version title
Tie Defender : Discount of 2 points on ion weapons.
Tie Interceptor: Like I already wrote in different posts in the past, I had granted a discount of 2 points for the second modification via the title.
Shuttle : A 1 point discount on crew and modifications would be cool.
Firespray: no fix required
Tie Phantom: no fix required
Decimator: no fix required
X-Wing : like above: 2 points on astromechs or 1 point on astro, torp and mod each
Y-Wing: too much new stuff on the way to get a feeling for the Y-Wings further needs
A-Wing: no fix required (i'm sure a lot players don't think so)
B-Wing: no fix required
HWK: Discount of 3 points on crew.
YT1300: no fix required
YT2400: no fix required
Z95: no fix required