Look, I don't think anyone wants to turn the X Wing into a superweapon. But currently, it sucks. And we're in an age of TLTs where 'good' ships are attacking two or three times per turn, getting auto-crits, double actions for a TL and focus, etc etc. 3 dice with a focus OR target lock just doesn't cut the mustard any more. The options are to make the X Wing more maneuverable to make it harder to dodge it's arc, and allow the X Wing to dodge arcs itself.
I don't like this option. I don't like how many ships treat the dial as an afterthought, and how the most important maneuvers they do each turn are the boost and barrel rolls that come after they reveal their dial. Movement in X Wing should always be primarily about your dial, and the X Wing was not hyper maneuverable so I don't think it's deserving of post-dial repositioning. Not everything in the game needs to be an arc dodging super-ace or a turret.
The other option is to make it's damage output more reliable. Either give it more red dice, make the dice it already has more reliable, or make it more able to punch through enemy defences. Maybe something like crits deal a face up damage card, and an additional face down damage card. Or enemies must re-roll successful evades, or whatever.
4 red dice on a ship that can only TL or Focus isn't that scary. The TIE Advanced with an ATC is already doing better damage than three dice.