http://us.battle.net/d3/en/calculator/demon-hunter#eXUVgd!bcY!YaaZZZ

I am trying to make a build that focuses on slowing down enemies while still being able to decent damage.
this build will mostly be used for pve/pve
active skills:
i took shadow of power mostly for the rapid fire skill to keep the enemies slow
i took vault to stay away from enemies and also this would be highly immobile with out it
passive skills:
vengeance because i only have one hatred generator, cull of the weak for 20% increased damage against slowed enemies, and steady aim not really sure about this but didn't know what else to pick (I am hoping i will be able to stay far away from enemies with the vault and slowing skills).

so what do you guys think of the build?
comments/ suggestion will be greatly appreciated.