Yeah, you need to find the sweet spots for each level like the above people have said.
I started quadding with my Wiz at 34 and stuck to The Overthere until my low 40s. After that I did mostly spectres (Oasis, OOT) until 48. After that I hit the goblins in Lake of Ill Omen until 52. I had some decent gear which gave me a good mana pool, so your milage may vary.
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Halfling Jesus
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