Armax Arena advise for insanity difficulty

Map: Pain Train
Faction: Cerberus and the Geth
Difficulty: Super Elite
Modifiers: None, you won't need it - this will never not be gold

Shepard:
I"m currently playing as a Power Casting Sentinel, but you can do this with any class as this Insanity cheese is basically shotgun play with grenades.
I'll equip Shepard with Armax Arsenal or Hahne-Kedar armor, anything that enhances ammo capacity or weapon damage, leaning heavier towards the latter.

Weapon:
N7 Piranha with High Velocity Barrel and Spare Thermal Clip

Squadmates:
Wrex
Health 2300
Shield 1380
6 - Carnage, all damage bonuses 30% + 50%
5 - Lift grenade, radius and capacity
6 - Barrier, all damage protection 5% + 10%
3 - Stimulant Pack, default
6 - Krogan Battlemaster, weapon damage 20%; power damage 20%; health and shields 40%, melee 30%

Grunt:
Health 2300
Shield 1725
6 - Concussive shot, Amplification (Concussive shot has properties of ammo powers)
6 - Incendiary Ammo, specced for health and armor damage bonus of +40.5%
3 - Fortification, default
3 - Frag Grenade, default
6 - Krogan Bersker, Weapon damage 20%; Power Damage 20%; Health and Shield bonus 40%, Melee damage 30%

Both Krogan are using Claymores with High Velocity Barrels and Omni-blades

Playstyle:
Why Pain Train? Because it forces every enemy into a small, narrow, confined space.
It's kind of like what the Spartans did in 300. It forces a one on one type fight; you can't get flanked; and the shotgun spray has a higher percentage of hitting something...anything when shooting in a crowded hallway.

The Krogan will be right in the thick of everything causing massive chaos. You as Shepard want to stay just on the perimeter of the fray.
What's the perimeter?
The walls. Pain Train's wall layout is in an alternating pattern. They form a zig zag, i.e you can't just move in a straight line. If enemeies are clustered around one set of walls, then you must be 2 walls away (it sounds far, but really it's not).

As the Krogan are doing they're thing, you're job is simply to aim your shotgun towards the center of the fray. 80% of the time you will be shooting through the walls. You can hit them. They can't hit you. This is why the shotgun mods are so important. You'll need to shoot through cover and often. You won't be able to add the "no ammo" modifier for this playstyle, but honestly you won't need the extra boost. Every round, you'll hit the max kill streak (10) and the fight will be over in 3 minutes.

Occasionally you'll throw grenades and detonate power combos, and once in a while you might have to resurrect Grunt. I have no idea why it's always Grunt and never Wrex.

Lastly, the Krogan have fortification and barrier but I found I stopped activating them by accident and it never impacted the results; you won't need to activate those powers for them. The games are so quick that you could play 5 matches in a row and instantly earn $50,000 for 15 minutes work.


Fun Fact: This strategy does not work versus the Reapers. The claustrophobic hallways actually work against you versus Banshees. They really are the worst lol