if you have access / friend with an sk around 110+ brother island is the place to PL. Swarm kiting has been nerfed many times but is still doable at lesser degree.
I pled cleric from 89 to 108 in about 5 hours of play. first off, trigger epic, pull and kill 4 mobs to get mortal coil to pop, then grab a few more ( i usually go for 8 per kill)
I cant remember what the formula is for working out what lvles can group. I think it is lvl + half lvl. so get a 112 sk then you just need to get to lvl 80 (less that 80 but thats close enough) and will get a level ever couple of kills.