Right now I gen. +98 life and only +35 mana per second.

Base damage is 1500

I am surprised there are not more WD using Raining frogs, its like the Acid on decay but does not annihilate your mana.

Rush in to a mob and get hit the Soul harvest, Damage goes through the roof and just stay on the frogs. Against single targets I alternate between blow dart and frogs as the frogs hit for 2 seconds and have splash damage.

Alternatively you can sub the Fetish Army for Acid w/ poison rune.

http://us.battle.net/d3/en/calculator/witch-doctor#aWUdPT!bWc!abZaZZ