I've been really digging crossbow lately, it's insane how good it is on both fronts. It's especially good when there's a spewer map, because it can kill 2-3 of them per mag now.
I like to run antichaff, because people tend to ignore it on the bug front in favor of primary weapons.
Crossbow,
Stim gun (unless theres two shields on the team),
Gas grenades (or thermite if we need more AT)
For strats I usually take regular machine gun, supply pack, 500kg (for occasional base clear/bile titan), and gas strike.
I like it more cause it's medium pen. Hive guards, brood commanders, spewers, just blast them in the face or center mass, no worries. I just like doing damage, which stalwart is good at, but you have to choose targets more carefully with it.
The reload time is painful sometimes, gas grenades kinda work as a stun grenade to buy you a few seconds. If you want to play more solo with it, take a regular pistol instead of stim gun to fend off the occasional hunter. If you hate sitting still to reload all together, definitely pick stalwart as you can run and gun with it much easier.
Also, the weapon handling on the machine gun, I forgot to mention but I take viper commando armor. Makes it feel much nicer.
Lately I have been running this loadout with great success. It packs a lot of heat to deal with heavies, and relies on the cookout/light armor combo to kill chaff and kite mediums-sized bugs.
Equipment:
Primary: Cookout shotgun
Secondary: Grenade pistol
Utility: Thermite grenade
Armor: Light with padding
Stratagems:
Recoilless rifle
Napalm Barrage
500Kg Bomb
Autocannon turret
I wish I was able to make my old favorite Eruptor/Flamethrower combo work, but I do not find it excels at anything anymore, even after the buff-everything update.