White Mage PSA on Myth Tomes.

[Zaft]

I know right? Like the spell speed of af2 and determination on allagan body are gonna make a game changer in coil!

That's min/maxing. Even if it's a 0.1% HPS increase, it's still an increase.

Af1.5 and allagan robe both have very situational uses.

Not really. DET is always a better stat for WHM than SS. There is, currently, no reason to ever use the AF1.5 body.