What level do I need to be to solo this quest? I'm 35, and I can't kill the will-o-wisp or even bring the soldier or mage down past half life. It's two level 34's and two level 32's, but they seem to have about 4 times the hp of normal mobs, and they're doing the same damage to me now as when I first tried the quest at 30 (when I had worse gear).

It's a level 30 quest. I figured being 5 levels over the requirement would be enough to make up for not having three other people with me. Any ideas?