Your skillset seems built around trapping the mobs in one place, and then raining death upon them. However, I find that in Inferno the mobs move a lot more, courtesy of them not dying while Grasped (especially Elite packs). I think it will be good to have a reliable single-target spell on (many use Splinter Darts, but I'm partial to Spirit Barrage).
If you have a problem with needing to kite the mobs so much that you cannot afford to cast your spells, Locust Swarm can be a good substitute for Acid Rain, since it is DoT and can hit the mobs even as they are moving.
Secondly, having to change builds for act bosses is a waste, because you lose all those precious NV stacks. SK looks doable with this build, but Butcher may be harder because of his enrage timer. I suggest beefing up your DPS, either through the AH or by farming SK.