AST cross-skills and Aero

[Elth]

Just asking for opinions here. Astros get their crosskills from WHM and BLM. Ofcourse, Swiftcast, ClericStance Protect and Stoneskin are mandatory.

For the last cross-skill, what do you guys use ?

Up until now i've been using Aero. However, after getting pissed off by the amount of misses i get from that skill on A3S, i've started to doubt of its effectiveness.

With 200 effective potency over its full duration, it's just as good as Malefic II for a little less mana and takes a GCD during which we can't really do anything (aside from moving). My WHM cohealer uses this GCD for Liquid Aura on boss pull, but as AST, i feel like wasting my time. So... for you, is it worth using or not, and what would you take instead ?

(I know, Combust I takes a GCD too and deals less damage for the same mana cost, but... it never misses !)