I dont think your going to get around leveling these any other way but groups of 5. Yea you could go run around and tag a bunch of mobs with the paladin and bring them to the 25man group of shamen and blow them away, but only the guys grouped with the paladin are going to get xp. and yes you will end up out leveling the Paladin this way and RAF will shut off if your levels are too far apart. Like 4 or 5 levels I think it says in the RAF FAQ.