I think my Ice/Ice tank is built similarly to yours. The only thing I definitely have issues with is toxic damage. Psi can be problematic, too, but those attacks typically miss whereas toxic always hits me. Otherwise, anything is tankable, including +4 AVs.
SG: Guadians of Paragon - VG: Paragon's Darkness
The Usual Suspects: Fimboolvetr (Icer Tank), Tsukiyomi (Mind/Psi/Ice Dom), Smiting Dragon (Dm/Sr Scrap), Widow Mortis (NW)
Up and Comers: Ameterasu (Km/Reg Scrap), Arrhymian (Elec/Nin Stalk), TDMKII (Bot/Traps MM)
Need some feed back from someone who has an Ice tanker.
On Mids I got his build up to 87.5 recharge and def to S/L/, energy/n up to 47%def without using his AoE def power, so if he's in a big mob that's +10% more def to all -psy. His DP with teir4 recharge is up every 95 seconds, so he can be perma HP caped. I think this toon can easy tank on a team with 1 or 2 buffers doing +4s. Does anyone think an Ice Tank would fail doing +4s or an AV.