I always liked Dulak's Harbor around those levels. You can go up a few levels there just by going from one boat to the other. The mobs drop lots of plat and gems, and they are well-spaced so you won't get way too many (on most occasions). Pathing can get quite wonky in places, but it's predictable after you see it a few times, and that happens mostly around the docks themselves, not on the boats or flat land. And if you're quest-oriented, there are some specific class-spells that are quested through the LoY expansion, which will go along with the zones others have suggested, ie Nadox.
When I PL'd my cleric (1st and only time ever pl'ing) I used the agro+ds method on my ranger, both in Dulak and Nadox. And I found the xp to go quite fast for little to no risk for either of my toons.
Anyway, when you first get to Nadox the SE corner has a lot of trolls that make great xp-fodder, and they will most likely drop a whole set of every type of defiant armor you might need/want.
If you feel that area is too easy, other good camps in that zone:
a) the spot Joph suggested
b) the spot marked "safe point"
c) the ramp leading down from the big central room to the "upper luggalds" area
d) the room at the west end of the southernmost hallway