You must have gotten me wrong.
I am not using FSc and I am not underperforming.
I was telling the guys arround here about the IT - RA build, for keeping the talons up and doing great dmg with Frost-stikes.
I am totally into it, and I will try it all out in two hours, when the raid begins.
Honestly I was playing frost for the last whole week in heroic 6/7 Nightmare
(we didnt manage to bring Xavi down yestday =C)
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If you get more runes, you get less uptime on Frozen pulse, which is a great dmg-dealer now.
I wouldnt recomend it.
If you want to play with MuEf for aoe, you could take Freezing fog, to maximize Aoe dmg.
But MuEf and Pulse do not stack at all.
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I would say that Icecap is good talent if you get the bracers.
If not, you should tick to avalanche for now, as this gives you more sustain Aoe paired with good st perfomance.
And yeah Crit(30%) - Haste (20%) - Mastery is the way to go.