There has always been a problem with elemental spells.
If you're casting an elemental spell on a monster that has no weaknesses to elements, then Thunder does more damage than Stone.
If you're casting Thunder on a monster that is weak to Water, but has no weakness nor special defense against Thunder, Thunder will still do more damage than Water, even if it's in the same tier. This makes no sense.
So I suggest simplifying and revamping the elemental spells by having ELEVEN tiers.
At Lv.1, a black mage would get all six elemental spells of the first tier, and against monsters with no weaknesses, all six spells would the same amount of damage. Then, if a monster is weak to Water, Water will do more damage than any other spell. I think this is how it works in offline FF games, but not in FFXI.
Then, for BLM:
Lv.II Tier Spells - Lv.11
Lv.III Tier Spells - Lv.21
Lv.IV Tier Spells - Lv.31
Lv.V Tier Spells - Lv.41
Lv.VI Tier Spells - Lv.51
Lv.VII Tier Spells - Lv.61
Lv.VIII Tier Spells - Lv.71
Lv.IX Tier Spells - Lv.81
Lv.X Tier Spells - Lv.91
Lv.XI Tier Spells - Lv.99
Sorry, I don't know how to make the spaces stick in a message board. It didn't save my formatting and " " doesn't work.
IMHO,
Windblade