BLM Aoe and Enochian

[Happosai]

So I'm still trying to wrap my head around what our current aoe rotation is. Fire 3, fire 2 x 2 flare, transpose repeat. Already if you cast fire 3 too quickly after mana regen tick I have found sometimes I dont even have enough mana for 1x fire 2, flare much less two. So do we wait an extra 2 seconds? If were waiting an extra two second why not cast blizzard 4? I was told that 2x fire 2's and flare is like 10% better than single fire 2 flare spam. So what are you guys doing during mana regen ticks? Are we supposed to move into melee range and cast a blizzard 2? Only thing that makes sense to me at this point...