Remember that RAF works on differences of only one level.
RAF works on up to 4 levels difference.

I just have 2 linked accounts. I have been playing to 10 then doing SFK to 20 then SM to 40 with an unlinked prot pally. One group I stopped at 30 and quested to 40. 2 mages did ~70k an hour doing STV 30-40. My other groups did about 130-140k an hour 30-40 in SM. My one group at 60 was mostly quested from 40-60. There are a couple of places where XP just flys by. Southern STV, Ungoro, WPL was sick. I also did cloth for a level and a half. I was set to do the WPL crap turn ins but the Cauldron quests ding'd me.

My overall plan is to get 4 groups of 2 to 60. 1 group is hunters which will go with 2 hunters I already have for a 4 hunter team. Then I have 2 mages, 2 shaman and warrior/druid. I plan on boosting 2 more shaman teams to 30 or 40 then gifting them to 60 to make a 4 shaman team. Then maybe doing the same for the mages or some druids. I have access* to 2 druids already, plus this one. So a 4th druid for a Boomkin of Doom team might be fun. The gift-a-level toons will be transferred around to even out the teams. My Pally is on an account all by herself, seperate from all the other teams which will be built around her.

*by have access to I mean they are on accounts in my name that my 2 minor daughters play, 1 each, that they do not share with each other but that I use. All within the rules, I know them, no lecture needed ty .