1000 character limit sucks...
What I really think could work though that can really benefit white mages is the ability to stack up to 3 lilies and having the consumption of them actually empower your skills to a stronger form. I think this could allow an appropriate balance of stronger / more valuable skills for WHM without necessarily making them overpowered and also creates a great deal more strategy by choosing when to utilize your Lily stacks in battle.

As far as examples:

-3 Stacks could empower a Cure to Medica
-Cure III cost no MP
-Medica could empower to Medica II
-Medica II could get a potency buff (up to 300) and buff to regen
-Raise could get power up to Raise II - restore at 50% HP with no weakness
-Regen is applied to all allies around target within 5 yards
-Holy Increased Potency and heal all allies in area of effect
-Esuna targets all allies