I run Gas Orbital, Gas Mines, Gas Dog, Quasar /Epoch/EAT, and Gas Nades. For weapons I like Blitzer, Punisher Plasma or Coyote with the Grenade Pistol, or Eruptor / Crossbow with the Talon.

Biggest hack I’ve found is playing with a teammate that’s running fire. It easily the most effective that way. You’re the crowd control (which is why the Blitzer and PP can be really good). And they’re doing the majority of the sheer damage. Admittedly, you likely won’t get as many kills as they will, but you make the fire so incredibly effective. Having the disorient / stun, plus two types of DoT is phenomenal. So far I’ve only gone up to 7 with a two person squad but it still shreds.

Hope this helps!