Personally I like the AoE rotation of High Blizzard 2, Freeze, High Fire 2, Flare, Flare, Flare Star. It uses enough of the kit. It still has room for the usual Foul and Thunder stuff.

The part that throws me is lower-level, especially when you first get Freeze, at 40. If the reduction in cast time from swapping elements doesn't also impact the recast timer, my understanding is that a cycle of casting Blizzard 2, Freeze, Fire 2, Fire 2, Fire 2, Fire 2 ends up being 664 potency (two 56 from "80 potency" at -30%, 3 144 for "80 potency" at +80%, and one 120 pot Freeze) while just casting Freeze six times is 720 potency. But it's worse, because with the timer changes Freeze six times takes 15 seconds while the "proper" cycle takes 16.5? Am I missing something there?