This morning I realized I never actually unlocked Diff9. So I started to tackle my objectives on 8 and lordy was it a damn shit show. First attempt I had three squadmates that were between level 11-18. I didn't want to kick them right away so I figured we'd drop and see how it went. Needless to say it went terribly, one left, booted another. Myself and one other tried to make it work while I waited for others to drop in, but it never happened. The other Diver ended up dropping so I abandoned the mission.
Next round, some higher levels joined. But nobody split up, I ended up going after the objectives solo despite some pinging. They kept dying/reinforcing around the same bug hole/breach. A third round I ended up booting a level 15 before the drop, during the match I had to boot someone else and then the others just dropped after repeatedly dying and getting overrun while sticking around the breaches.
I don't know if it was just a weird morning or what. I normally join matches at Level 7/8 and for the most part, the randoms seemingly know what they're doing, will split up, will disengage, etc. But this morning as a host? yikes.
Will take another stab at it later.
EDIT: Helldive unlocked! Had a great group of randoms and we got through it without too much issue. I was expecting a much larger cluster in 8 compared to 7. So maybe I just got lucky and had the right group.