Tested again. Conditions: 252 natural Piety, no party buff, no non-GCDs used, no food buffs, no one else attacking. I attacked the three dummies in Dragonhead so all three were hit. I timed each test precisely 5 minutes, give or take a GCD.
Blizzard II spam
327 DPS
Total Overall Damage: 96,647
Damage Crit Percent: 17.34%
Fire III > Fire II X N > Blizzard III > Blizzard II or wait depending on MP > repeat:
347 DPS
Total Overall Damage: 102,045
Damage Crit Percent: 15.19%
As you can see, for sustained AoE, the Blizzard II method is definitively lower sustained DPS. The Fire II method crit less by chance and it still put out more total damage. However, since most/all AoE situations don't last 5 minutes, I did three smaller tests of one minute each for each method, which is much closer to a sac pull AoE situation or killing the T4 bugs.
Blizzard II
328 DPS
18,959 total damage
323 DPS
18,667 total damage
330 DPS
19,087 total damage
Fire III > Fire II X N > Blizzard III > Blizzard II with MP, wait without > repeat:
403 DPS
23,054 total damage
366 DPS
20,268 total damage
344 DPS
20,978 total damage
The DPS was slightly off since the timing wasn't set in stone on my begin and end time, being roughly a GCD apart. Sorry about that. Anyway, I think it's pretty safe to say that Blizzard II spam is not the highest DPS for AoE, but if anyone wants to take more accurate tests, be my guest.
