Blue Mage DPS Versus Other Casters

[Rongway]

One thing to note, is that for BLM, Astral Fire's damage boost stacks with Maim and Magick to mean that Fire spells during Astral Fire have a 2.1 multiplier rather than a 1.8 multiplier then a 1.3 multiplier so that 5x Fire I only deal 1890 potency rather than 2106.

Are you sure they're additive?

Also, Firestarter procs exist, so that 40% of Fire I GCD's are replaced by Fire III's.

Fire I GCDs aren't replaced, though. Since Firestarter Fire III is free, it's in addition to Fire I rather than instead of it. That's why I gave a range of 0 firestarters (damage of 8 GCDs) to 5 firestarters (original 8 GCDs + 5 Fire IIIs), since the number of GCDs changes with each Fire III cast. Buut it's possible I added that edit after you'd already begun your reply?