Trying to get the most out of this here.

I have 7 accounts:

-- 1 "Main" account that I raid with (2 70s on it)
-- 1 "Alt Main" account (70 Prot Pally for boosting)
-- 1 Miscellaneous Account (alt bank and whatnot)
-- 4 Shaman accounts for my team

I know I want the mount on my "Main" account and plan to use the "Main" to MB with anyway, so there's one. I want to leave the Pally's account uninvolved so I can boost easier. The Misc. account will also stay uninvolved. I want to get a full party of 5 making 3x XP. My Shamans are all only in the low-40s; should I remake the Shamans and PL them all the way back up? What's the best way to take advantage of this: cancel 3 Shaman accounts and get three more for the bonuses?