The following list is designed to perform in all phases of the game with the squadron phase being heavily neutralized. It appeals to my sense of what an Imperial 'flotilla' should look like.

Name: 137th Imperial Battle Group
Faction: Imperial
Commander: Moff Jerjerrod

Assault:
Defense:
Navigation:

ISD Kuat Refit (112)
• Strategic Adviser (4)
• Gunnery Team (7)
• Electronic Countermeasures (7)
• Leading Shots (4)
• Flechette Torpedoes (3)
= 137 Points

ISD Kuat Refit (112)
• Moff Jerjerrod (23)
• Skilled First Officer (1)
• Gunnery Team (7)
• Electronic Countermeasures (7)
• Leading Shots (4)
• Flechette Torpedoes (3)
= 157 Points

Raider I (44)
• Ordnance Experts (4)
• Flechette Torpedoes (3)
= 51 Points

Gozanti Cruisers (23)
• Comms Net (2)
= 25 Points

Squadrons:
• Ciena Ree (17)
• Valen Rudor (13)
= 30 Points

Total Points: 400

If you're going flechette torpedoes I'd swap out the gunnery teams for ordnance experts. Double rerolls on that one black flak to fish for crits is almost necessary if you want them to go off consistently.

Gunnery Teams allows me to attack ships and squads in the same arc and Leading Shots will allow me to spend the blue die to reroll the black. OE would help the ship vs ship, but it's a trade-off I want to test.

With your firepower being so much higher at short range, it would be nice to have activation advantage. I propose dropping the Raider for 2 more Gozanti:

2+4
Author: Starwars Tabletop

Faction: Galactic Empire
Points: 399/400

Commander: Admiral Motti

[ flagship ] Imperial Star Destroyer Kuat Refit (112 points)
- Admiral Motti ( 24 points)
- Strategic Adviser ( 4 points)
- Gunnery Team ( 7 points)
- Electronic Countermeasures ( 7 points)
- Leading Shots ( 4 points)
- Flechette Torpedoes ( 3 points)
= 161 total ship cost

Imperial Star Destroyer Kuat Refit (112 points)
- Gunnery Team ( 7 points)
- Leading Shots ( 4 points)
- Flechette Torpedoes ( 3 points)
= 126 total ship cost

Gozanti-class Cruisers (23 points)
- Comms Net ( 2 points)
= 25 total ship cost

Gozanti-class Cruisers (23 points)
- Repair Crews ( 4 points)
= 27 total ship cost

Gozanti-class Assault Carriers (28 points)
- Comms Net ( 2 points)
= 30 total ship cost

By my experience, 1 brawler and 1 long range isd is a lot more optimal than 2 brawler.