Warsliks Woods, go into the brute tunnels and head down to the Crypt of Dalnir zoneline.
The skulking brutes are very managable, there are plenty and can be single pulled carefully without lull. I did this with my paladin until -30ish and it's the exact kind of slow paced soloing you are looking for. No casters, right at a zoneline in case of trouble. You might even pick up the occasional Dalnir group like I did if you get bored.
You might need a couple more levels though, they're level 22. The cons are that it's pretty out of the way (you might need to use an invis pot to get down to the dalnir zoneline) and that they don't drop much for loot.
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