I know FFG is hesitant to overly meddle... but some of these interactions are getting scary.

I started with trying to find a way to use the currently VERY powerful Biggs/Lowhhrick combo to make the U-wing competitive enough to enjoy at a local game night (3 game swiss). Started out with a raging cassian/lowhhrick and will probably test that on vassal. ....But some dark corner of my mind went to this...

Place Lowhhrick in one of your corners facing out at a 45deg angle. Place Cassian in front of Lowhhrick facing out at more than a 45 deg angle set to cover more of your side of the board. Set Biggs facing out with a slight angle (15deg) to the outside of the board, with corners touching Cassians.

You can now fortress, covering all approaches. Regenerate a shield for Biggs each turn. Give Lowhhrick the ability to reinforce and rage each turn. Cassian will have no modifiers but be able to gunner.

Star Wars X-Wing Miniature - Break the Game

Ship Total: 29

Can you link to the squad and a crude depiction of this setup?

In the original post I linked a vassal screenshot of the setup. Looks like you would need to download the file and open it in vassal.

Set up that way you would do a one straight green with The Wookie A1 soft or straight green with Biggs. A 2 hard with cassian.

I once tried to build a fortress list. They seem so appealing at first glance, but the tragic thing is, once someone melts, the whole thing tends to. Not to mention the fact that you won't be able to fully capitalize with an attack from all of your ships very often. It also lets even low PS opponents missile/torp strike the $#!+ out of you because they know exactly where you will be.

I don't see how your offense is particularly relevant. Three 3-dice primaries with no mods, only 2 with arc on any given turn. Have you actually put this on the table yet?

Rage gives rerolls and focus so only one shot is fully modified. And no I would never put this in the table. I have won a store Championship with Biggs and the wookie. It will be boring to fly because you're not flying and a horrible experience for your opponent. Look at other threads to understand the biggs Wookie relationship.