Maybe as far as PLD goes, add another cure spell somewhere in between Cure IV and Cure V. With the below gearset as a Mithra PLD, I can get Cure IV to about 550(roughly 1/4 of max HP.) Using the same gear, Cure V would yield around 970(little less than 1/2 max HP.) What about a cure that sets somewhere below the midpoint, maybe 650~675(with gear,) and then also have an enmity modifier similar to Atonement that would enable the cure to reach upwards of 775~800? Was talking about it ingame with Byrth who said maybe if it was only self target, which I don't see a problem with, but I'm sure there's someone who will; but anyway, here's the gear(I'm also aware that people would not be using the weapons in this set.)
Galenus (+10% Cure Potency)
Dagda's Shield (+5% Cure Potency)
Oneiros Pebble (5VIT)
Kaiser Schaller (Augment:+5% Cure Potency)
Aife's Medal (6MND)
Hospitaler Earring (+5% Cure Potency)
Oneiros Earring (Cure received +5%)
Twilight Mail (15MND 15VIT)
Tropic Gages (7MND)
Aquasoul Ring (7MND)
Sirona's Ring (3MND 3VIT 10Healing skill)
Valor Cape (6VIT)
Cascade Belt (7MND)
Blitzer Poleyn (VIT+2 Augment:+5% Cure Potency)
Valor Leggings +1 (4MND)
Total: +30% Cure Potency (+35% with Oneiros Earring)
MND 78(Mithra Base 95PLD/47WAR) +49 = 127
VIT 86*Mithra Base 95PLD/47WAR) +42 = 128
Healing Magic Skill 345(95PLD cap without merit) +10 = 355