Give your pet a Wu's Quivering Staff and go nuts in Kurn's. No damage cap for pets
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Unrest is terrible, too easy to get swarmed, trained or something else wasting your pet.
Otherwise for slower but safer exp, NRo is decent enough. Nice mob level gradient, guards to run to and plenty of spots to safely sit if you want to take a break and afk. I got my wizard to 15 in NRo in about 5 hours. I could have gotten a couple more levels there, but I mismanaged the pet.
Also, when you're playing your rogue, whatever you do, don't hide.