Black Mage Sanctuary - A Guide to DPS

[Gwaeron89]

Do you mean that its a gain to not cast Bliz 4 and wait for a slow manatick in the event that you have no foul or thunder cloud proc?

No i mean its worth casting b4 instead of waiting for mana tick to get full mana for astral phase if foul is on cd during umbral. It shouldn't happen too often though.
And when using 5xf4 rotation there's usually no mana left to cast anythnig requiring mana after switching to umbral. So in that case the priority is - casting thundercloud first then foul -> casting foul fist then t3 -> waiting for manatick and hardcasting t3 then foul. If foul is on cd replacing it with b4 may be an option to avoid situations where mana is not fully restored during astral. I hope you understand what i mean.

additonally.. There are alot of occasions when you may have foul but you dont have thunder cloud. If you use Foul first then thunder 3. you run the risk of entering astral with slightly too little mana to cast the final F4

I don't think it can be 100% avoided, unless you want to wait for manatick to hardcast t3 before foul. I just accept it as is and cast 4 f4 during astral in that case.
Alternatively, if convert is not on cd, it can be used to change 4xf4 into 6xf4 without wasting mana.