Quote (Synonym @ 14 Jan 2011 10:26)
117% FCR is mandatory. In terms of long runs or great amount of runs, the number of teleports and casts can be numbered in the hundreds, which would mean an enormous amount of time and damage lost because of a single frame. You don't see it after 1 or 2 runs, but you would see it after 500 runs.
This.
I would - thinking the whole thing through again - definitely drop Raven and get an FCR Ring + higher FCR Amu to reach 117 FCR.
cnbf will only be helpful while slowd via Holy Freeze or when a Cold Enchanted boss explodes. Vs. both possibilities, there's one thing that is efficient: Doing what a Sorc does best

killing fast from a distance!
Cold Nova from exploding monsters should NEVER reach you and Holy Freeze wears off once the monster is killed. Also, except for walking and IAS, cnbf won't influence any other animations (FHR, FBR, etc), so it would never be deadly to be frozen. As a last resort, you could re-position yourself via Teleport if there is any danger.