Been a few posts about this. The human mobs in the Onslaught camps are 72-73 and you can pull 10-15 per camp, there are 5 or so camps of them, all melee, and they respawn fast. You do a round, and by the time you get back to the first camp, is spawned. unrested that is about 10-15k exp per pull at 72. and 8-12k after 73. Try it and see how it works. Also In grizzly hills there are big packs of mustangs roaming around. I hear those are good as well. They are 73-74? maybe 75