I love to promote the
Per-Level Hunting Guide, and in this case it has a bunch of ideas because I'm a shaman and I added most of them
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On Loramin I did a lot of Howling Stones, but you might be too low for the basement. If so you could duo it (necros are often interested in this) or you can just solo the entrance. It's marked as 57 in the guide, but I think that's a little high; the tricky part is just surviving 0-2 harmtouches when you first zone in, and then it's simple root/rot ... and if you zone-in at a popular time you don't have to worry about HTs at all because someone else will have cleared them. Likewise Sol B imps are probably too high to solo just yet, but a duo should work well.
For just soloing Kedge has some fun loot and a good dungeon XP bonus, but you need a Fishbone Earring (don't do it with EB unless you use Gina or something, because Murphy's Law guarantees it will fade at a bad time). Same thing for Chardok, and it's not underwater (but it does hut Chardok faction, and the revamp is coming someday). If you want boring and mostly loot-less XP there's Skyfire or Eldak Howlingbear and Mentrax Mountainbone in Frontier Mountains (two melee mobs with no loot that respawn every 6 min).
And of course if you want to keep up the "evil path" you can kill Kelethin or Halas guards.
Oh, and one last thought: I have Burning Woods giant fort listed as going up to 56 in the guide. If memory serves that might be too high for it, but if you can get XP there at 55 it's a
great spot for Shaman soloing. Oh, and you
might be able to get XP in the Hole somewhere, but I think you'd have to go deep enough in that soloing it would likely be a bad idea (so this would only really work if you went with a group then hung out there after).
P.S. If you try any of these spots and find that the guide has the wrong levels, or anything else is wrong,
please consider editing the guide to fix them. The level ranges in particular are often off by a level or two because I didn't check every spot at every level as I leveled up.