My Personal Highest Kill Count Thus Far
Planet: Fori Prime
Difficulty: 7
This loadout has worked great for me, though I'm more dependent on my teammates to take out Bile Titans. I suppose this would fall under Tips/Tactics.
Armor Passive: Siege Ready (Engineering Kit may be preferable for the extra gas grenades. Siege ready does nothing for the Eruptor's ammo count, and reload speed seems debatably useful.)
Primary: R-36 Eruptor (Nest closer mostly. Kills dense crowds quickly. Takes medium units out in 2 shots; sometimes 1. Always hit bile spewers with it. Watch the ammo.)
Secondary: GP-31 Grenade Pistol (Backup nest closer and dense crowd clearer in a pinch)
Grenade: G-4 Gas (area denial and causes enemies to be incredibly confused.)
Strategems:
Machine Gun (Crowd clearing. Helpful when dealing with chargers if you )
Gatling Sentry (Cover fire in all situations.)
500 KG (Titan killer, and destroys spore spewers when combined with either the grenade pistol or a couple shots from the Eruptor.)
Dogsbreath (Keeps all the sneaky guys from getting too close. Marks retreating Stalkers with gas clouds.)
General Tip: I can fair pretty well when left alone, but only because this loadout lets me safely retreat when I really need to. As the saying goes, when the going gets tough, the tough gets going. Difficulties 8 and higher, stay with the group. Haven't tried to solo Fori Prime in the higher difficulties, and I'm not considering it.