Below are some of my attempts at a few lists. Just seeing how the community feels about them:

First

Keyan Farlander

-Push the Limit, B-Wing/E2 Upgrade, Kyle Katarn

YT-2400

-Heavy Laser Cannon, Lando Calrissian

Bandit Headhunter

Bandit Headhunter

Second

Dutch

-Ion Cannon Turret, R5-K6

Garven Dreis

-Flechette Torpedoes, R2-D2, Shield Upgrade

Biggs

-Flechette Torpedoes, R7, Shield Upgrade

Third

Jan Ors

-Ion Cannon Turret, Kyle Katarn, Moldy Crow

Keyan Farlander

-Push the Limit, Advanced Sensors, B-Wing/E2 Upgrade, Tactician

Tala Headhunter

Tala Headhunter

So which would be most competitive? Tips on how to make things better without deviating from the models, but perhaps changing some upgrades?

First - presumably that YT-2400 has the Outrider title, correct?

Second - use good ol' R2-F2 on Biggs, much more reliable

Third - even if it is his ship, swap Kyle for Lando, who can generate vital Evade tokens in key moments while still building up a few Focus before the furball kicks off. Just tell Jan Lando won the Crow in a sabacc game.