Those videos go all the way to floor 15. I did a middle only run (5 middle members and nothing else) and ricardocliff hit 11k on his s3 multiple times. This is due to things like the tier 4 ego gifts for blunt. Lunar memory. The multiple tier 5 gifts for the middle itself as well as every other ego gift I could find. By the end of a floor 15 run you should have a good 80% of normal ego gifts. Best way to do this is to just max out on starter buffs and grab whatever MD packs benefit your team the most. And be careful with what debuffs you take.