While gearing up, roll +fire and +cluster arrow on gear, and get a reaper bracer with +fire, +cc (farm malthael for this). Learn which mobs tend to instagib you and vault to avoid it. Generally you can kill most things before they get to you (or you just vault back once). You don't have to kite much. I recommend marked for death(contagion) or smoke screen (whichever you prefer), vault, pet(wolf), vengeance(the hatred regen rune), some builder skill, probably grenades (tinker) or the slow chains one (with the 6 hate rune) for hate regen and because they're fire), and cluster arrow (loaded for bear) for massive, massive damage).
Take perfectionist, the 30% dex->armor passive, blood vengeance, and archery or steady aim as your passives. Try to use globes or potion for healing. If you don't find things killing you all the time, you might replace perfectionist with ambush.