I'll start off with this:
I will stay frost. I KNOW that it's the worst DPS spec for a mage in raiding. I just happen to love the playstyle of ghosting Icelance on FoF, that's all.
To the meat of the post now, eh? I've read in a couple places that there comes a point where using Brain Freeze procs is worthless. I assume this is when my Frostbolt gets closer to a 1.5 second cast? I haven't been able to pull a reliable result from the target dummies on wether at my gear level BF procs are a loss in DPS.
Does anyone here know anything about this subject? I really do appreciate any help.