I have a full write up on how I farm bosses for act I inferno. I explain stacking nephalen valor, what abilities and passives to use, and how to avoid ever getting hit by the butcher.
Here's my full post, feel free to ask questions here or on the post directly:
Here's my full post, feel free to ask questions here or on the post directly:
http://www.diablo3goldguide.net/2012/05/act-i-inferno-boss-farming-demon-hunter.html
Nice
Have you considered changing the passive for vault?