So it's been a while since I've done this, but here it goes. Let me know if it's at all decent:

Objectives: Precision Strike, Hyperspace Assault, Minefields

Pelta Command Ship: Phoenix Home, Lando, Skilled first officer, Engine Techs, and shields to maximum

CR90 A: TRC, Tantive IV, Raymus Antilles

CR90 A: TRC, Leia, Jaina's Light

Nebulon-B Support; Salvation, Slaved Turrets, Skilled First Officer, Mon Mothma

Fighters:

5 X-wing squadrons

4 Z-95 squadrons

CR90's skirt and hunt objectives while the Pelta, Nebulon, and fighters drive head on if they can. If not they can all play passively.

The pelta has to navigate to use ETs, repair to use STM and it is the only ship with a decent squadron value. Tantive can take some pressure off but it will be over worked. Hondo could help a little.

STM is a poor concept as most enemies won't spread damage on all of your ships but concentrate for kills. Swap the fighters for rogues or swap the Pelta for an AF2B with flight controllers and ex hangar or BC. Your Z95s will still be uncontrolled even if you do this so swap them for Jan and Biggs with 4-5 X-Wings which will last an age with Jan lending braces while Biggs spreads the hits around.

as @Mad Cat said shields to max don't work because your opponent will focus fire, the only build I have seen value for them is a Hammerhead Task Force Antillies shenanigans because it FORCES damage to spread on all your ships(and even that has issues like getting one shot preventing much use in spreading damage)

Lets see your list is going too many directions.

Pelta Command - this is your carrier, so you should equip boosted comms if you have it, if not, expanded hangar bay, and give the fleet order all fighters follow me.

If you use the phoenix home title, you should try to get a synergy between your officers, the best example for this ship is Raymus Antillies+Ahsoka Tano allowing you to get a token every turn regardless of order and change it into whatever type you want.

Cr-90A - cheap, TRC(maybe intel officer? really expensive tho)

Cr-90A - cheap, TRC

Neb -Escort variant to help push squadrons

I am assuming you have Y wings bc the core set only came with 4 x-wings

Dutch

Norra

5x x-wings(maybe add luke or wedge in place of x-wings)