why farm just keep2?
Since 1.07 the white extra drop granted by monster power no longer requires 2 NV stacks.

mp8:
http://youtu.be/rP8B6TjZZp4

mp9:
http://youtu.be/kZ-_phnsBDY

old version with triumvirate:
http://us.battle.net/d3/en/forum/topic/7980248981#1

max crit chance for wicked wind hits 80%
2.52 APS
9apoc
1400 LOH
297k scoundrel
385k deep + MW
462k cold blood

sns / electrify :
wicked wind
electrify
diamond shards
chain reaction
deep freeze
shocking aspect
Critical Mass
Cold blooded
Astral Presence