I reworked the list a bit. I took the suggested skills on the Leader and Champions. I deleted the Mesh Armor on Somara (Shotgun Sister) so that I could go full Toxin on the Death Maiden. I'd forgotten about the Poison Blood rule, which is useful enough to make it worth going all-in on Toxin for this one fighter. Her number of attacks is enough for hoping that at least one gets past armor and toughness. The Leader or Champion will eventually get a Power Sword (Spear) for variety and dealing with more heavily armored targets.
The Stub Gun is indeed cheaper and more accurate up close, but I decided on Auto Pistols for the two Little Sisters for slightly better melee damage. It's worth the extra 10 credits.
Far Dareis Mai
Sulin, Queen with Boltgun and Mesh Armor. Dodge.
Nandera, Matriarch with Boltgun and Mesh Armor. Dodge.
Melindhra, Deathmaiden with Stiletto Sword, Needle Pistol, Chem-Synth, Mesh Armor and Armored Underwear. Spring Up.
Dorindha Specialist Sister with Grenade Launcher and Mesh Armor.
Somara, Sister with Shotgun.
Bain and Chiad, Sisters with Lasguns.
Enaila & Jalani, Little Sisters with Stiletto Knives and Auto Pistols.