You’re gonna want Build Up much, much earlier, you maniac. Tough and Weave are also not worth putting off Blizzard.
If you’re gonna 5-slot a Power with purples, like you’ve done with BFR and Ice Storm, skip the Damage IO, not the Dam/Rech/Acc IO. You can boost one or more other IOs in the set to +5 to still hit the ED cap for damage.
Slot Freeze Ray for damage, not hold; it’s your highest DPA attack outside of Blizzard.
Put recharges into Energize so it’s perma. You can take the slots from Health; perma-Energize will do much more for your HP and End than the Numina and Miracle uniques will.
For my money, Intuition Radial is the best Alpha for Ice Blast. The only thing you can’t benefit from in Intuition is the defense debuff, everything else it gives is useful.