In my opinion and Loadout the BEAST, fast Killing Bug Weapon.
Level Difficulty is Extrem(lvl7) in this Clip!
I have not testet the next 2 lvls.
Maybe on Helldive the Arc Thrower is not strong enough to beat Charger with 8 Fast Arc Thrower hits.
Kills 3 Enemy at once(small ones).
Arc Thrower Mechanic(After Full Discharge, half Charges...for more dps)
Charger needs 8 good hits(lvl 7 Extrem), also the flash that jumps to another enemy deals the same dmg(kills 2 Chargers at close the same time...i mean in seconds.
You have not to load the weapon to 100%, stay close to 50-60% of loading...then again (doubles the dps!).
After that test i changed the Laser Drone to Autocannon Sentry(versus Titans, and the short cooldown versus Orbital Strike).
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My Loadout:
1•Breaker Shotgun(when Stalker or Enemys come to Close for Arc Thrower... Shot Misses).
2•SMG
3•Grenade(explode on contact)
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1•Arc Thrower
2•Autocannon Sentry or Shield(when you are good Kiting...then Autocannon Sentry)
3•Mech(for even more Firepower vs Titans or huge bug groups)
4•Orbital Railcanon Strike
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Light Armor Set(Helm and Armor for Free and Max movement).
Best regards