This is because you use 4x Wizards. Really you should try and replace one of your Wizards with a Witch Doctor. Since you are not going to close range you don't need Horrify (and you don't need the helm), instead use Hex+Jinx and everything coming close to the team is transformed into a pig. And, most of what is not pig-ified attack my dogs or fetishes instead of my Wizards.
Note that 4p bonus of Zunimasha is mandatory for high-level GRs. Also I'm trying a Blind Faith helm for the blind effect, but so far I haven't noticed a big difference. Template and gear is here :
http://eu.battle.net/d3/en/profile/Erha-2932/hero/48211560
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