A lot of what you said is wrong. The "basic" rule of thumb is 2 AGI > 1 MAB > 1 AGI. But that's pretty crude, and someone ended up with 1 mab ~= 1.26 for his setup. But crude isn't a big deal because COR has limited MAB options, and the "ideal" setup favors agi over MAB anyway.
For atmas, the ideal setup max dmg atma set during non-brew is Ultimate, PW, Fire dmg. Most people don't have PW, so the more common set is 2x fire dmg, Ultimate.
1 fire dmg atma + Griffon claw is worse than 2 fire atmas because:
2 fire atmas adds 1.3+1.3=1.6x dmg
GC+1 fire atma adds 1.3*1.2=1.56x dmg
Unless something changes, as of now during non-brew, 2 fire atmas will always be better than 1 fire + Griffon claw.
During brew, what you said is right. 2x fire, Griffon claw.
No, it was proven a while ago that level 51 staves are DIFFERENT than elemental dmg atmas. (However, the Magian Affinity staves are the same as the atma, but that's an issue for BLMs)
The formula should be more like:
Damage = (( Lv+2+WSC ) * fTP + fINT ) * Resist * Lvl 51 Elemental Staves * Affinity/Atma * Weather * MDIF * Magic Damage Adjustment



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