The settings are at the bottom of my OP. As for the setup I can't explain it much better than I already did. You rush to the hacking point, killing the one enemy en route. When the enemy respawns and enters the room, you position yourself so the pillar is between the enemy and you and continue hacking. The enemy will try to un hack the pillar while you're hacking it leading to a stalemate and endless exp.
400,000gs reached 1-13-15. Used D4 to get it (get it, it has 4 in the name) due to my disgust with how Halo: MCC has been handled. Achievement used for 400k milestone: Business as Usual.