Leveling 80-85

[Pazgaz]

I'm in the process of getting all classes at 80 on my 5 main accounts using RAF. Already have a few 85's (pala, shaman, mage and a team of pala+4xshaman).
So far I have 2 accounts with 10 chars at level 80 or above, and going to start working on 2 other accounts today.
When I'm done I'll start leveling them to 85 one team at a time. What is the fastest way to do that? On my first team I grinded instances (except for some hyjal questing to get some gear upgrades), but it felt A LOT slower than solo leveling through quests. OTOH, I really dread the gathering quests...