I know it might slow down your FFQ production slightly, but you'd get a better quanta balance if you went -6 Emerald Tower, -6 Air Tower, +12 Air Pendulum. You might want to try it both ways.
Also, if you're shooting to use the Fire Lances as a quick finishing blow, consider Unstable Gas instead. It's more vulnerable since it's a permanent, but you'll get more damage out of it in the vast majority of cases.