I'm partial to the heavy slugthrower at the moment. That 80 piercing can punch through lot of armor, and up to their optimum range, they are very accurate. I have a couple of gals who run seductress armor at the moment as well for when I run into power armor (these are the same gals who used to be my archers.) Armor rating does very little against charm damage
I also have an advance team, but they're armed with Riot Shields and Electro-whips/Zappers or a Bardiche, or Arena Flak Cannons depending on their specialty. Most are wearing Tac Armor(H).
I also keep a mortar, rotary grenade launcher, and recoiless rifle around for big nasties, and some super-chargers for low impact missions where I'd rather conserve ammunition.
Tactics wise, I'f I'm not doing what you do, I tend keep a sniper near my ship if applicable (sometimes in a grav harness if I'm expecting dense terrain), and then move the remaining gals in groups of twos and threes. One with a Heavy Slug Thrower/Flak Cannon, one melee oriented, and one Seductress (who also is armed with a zapper so it isn't so fatal if they go bezerk) I have the groups methodically clear on side of the map, while the sniper makes sure that nobody tries to move into the cleared areas.
Overall it works pretty well. Marsec and Megapol have very little defense against charm, and the sheer firepower of the Slug Thrower and Flak Cannon can punch through most of the non-powered armor I've come across with little-to-no effort. I switch to my backup loadout of Battle Rifles and Super-Chargers for reticulans, since they can't take much punishment.
The only group to give me trouble so far is the Ghouls, since they can take enough punishment to survive my alpha damage, though the Flak Cannon still sends them packing. I haven't met Raiders or Dark Ones yet. I'm in March of 2602.