So in terms of healer mana regeneration during combat, I am noticing a potential balance issue concerning Scholars vs. White Mages.

The White Mage ability, Shroud of Saints, restores a flat amount of mana back, and does not take into account gear upgrades, and stat increases. Meaning: A brand new level 50 WHM that is Naked (No Gear on) will restore the same amount of mana per tick as a WHM in full DL/Allagan.

Scholars have Aetherflow, which will restore mana equivalent to 20% of the caster's MP pool. Aetherflow at level 50 grants 3 stacks, which can then be used to cast another Ability to restore MP, "Energy Drain." Energy Drain will restore 50% of the damage dealt, as MP back to the caster, this amount is doubled by the Arcanist Trait, "Enhanced Energy Drain." Scholars can Use Cleric stance to increase the damage dealt by Energy Drain to increase MP restoration even more.