The standstills are a constant headache, yes. At times you can ride them to victory like nothing else, while you completely loathe drawing them at others. In fact I think they are worse against control than aggro, because aggro's gameplan is so dependant on killing quickly before the opponent gets a chance to build up. Zoo has a stronger midgame than most other aggro like stompy/sligh/sui, so if you can reach that your odds are getting better.

That build I posted above beat Stompy 4-1 in testing but got it's ass kicked against Keeper, only winning one duel out of five. I felt that most of the losses came from having too many conditional cards (like Matt said) and thus not being able to put enough early pressure on the keeper deck. I went fairly even with Enchantress, winning 3-2 (mostly thanks to mana disruption), but lost 2-3 against Stacker (blood moon totally wrecks this deck).

Conclusions:
* Remove standstills in favor of more aggressive cards.
* More bolts are needed since the loss of standstills hurt the aggro matchup, Incinerates > Chains since I run all 5 moxen.
* Lower mana ratio, since no standstills means greater risk of mana flood.
* Cut black to decrease the number of dead cards under blood moon/b2b

I'll post a new list soon...

Lastly, some questions for Matt: What do you think about cutting Sylvan and Windfall in favor of two PoP's? And Isn't 4 shamans one too many?