Probably won't help you since different servers but we still do Aeonic merc runs on bahamut every 3 weeks. We have carried 10 before at once but I prefer to take 8 guests per run. They generally fill up with 8 guests and are usually in a full alliance with 8-10 Gunslingers (sometimes we box GEOs), and clear times are usually around 3.5 from the first popped NM to the last. Generally melee everything and only bring a tank or manawall blm for 4 of the helms at this point.
The rmt who do them on bahamut are total trash, they takes 8-10 hours to carry 1-2 with a bunch of Nirvana SMN bots. Always good for some laughs to watch them wipe consistently on Kirin, Vini, Albumen, zerde etc. Must be hard to *** up conduit but these guys are pro at that. I don't think they get many buyers, usually it's JP players who don't know about the 3 very good groups who still merc them here, or returnees that don't know any better.