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.
HALO:MCC >>>>>>> Interested in Online Customs, Squadmates for Ranked, and Co-Op Campaign. I am on 6am-4pm GMT on my nights off (Midnight-10am US Central). If you add me do it on XB1 please; my 360 friends list is nearly full.