I just do F3 > Fire II spam til low mp and still enough to cast Flare > Convert > Swiftcast + Flare > Transpose > Scathe > F3 > Fire II etc (Just that 1 scathe for me gives me mp back and by time I start casting F3 I have nearly full mp again to restart my chain.)

Also using an aoe rotation with both Flare and Fire II imo is a lot more damage than just Flare. And people who don't buff Flare with F3 are well... for lack of better words, just stupid imo sorry.