Agreed with angrymanagement I would only switch from EoTS to Chilling Presence, for the 10% more crit and double damage on frozen target Im using At wills Magic Missile and Ray of Frost (but I only use RoF) Encounters: Shield (tab), Desintegrate, Icy Terrain (or EF. But I dont like EF), RoE Sometimes I change Icy Terrain…
I think, as I stated on other post, that CHA is better then WIS. I race rerolled to Sun Elf for the +2 CHA race feat, and I'm doing way more damage now, and I'm also getting more AP, as I have more Critical Chance.