The Brutes Caves in WW near Dalnir are super awesome level 25-30. I think I might have pushed my luck and did 30-31 there as well, but realistically 30 is where you need to leave... so I am not sure about quadding them at 31 to get to 34, you might be disappointed.
My wizard is "stuck" at 31 as well hehe.
She is parked in SK spires killing gnolls, camped in South Qeynos where I gate back and then beg for a wolf form lol (Dark Elf Wizard
[You must be logged in to view images. Log in or Register.]). That is not going very well. I think I'd need 34 as well to renew interest in that toon ;A;