Source:
http://vanafratello.seesaa.net/article/459618093.html
Rough notes:
Full Cure amount changes with MND, healing skill, cure potency like normal cure, but it substitutes target VIT with caster MP.
He tested Full Cure with Cure Potency 50% + 8%II and Afflatus Solace +24 and full MP (don't know the exact amount)
Getting hit by 4000 Needles resulted in only 1890 damage taken. So the Cure Skin had a potency of 2110. The normal Cure Skin cap of 300 still applies but the Afflatus Solace+ items brought it way over the top.
The theoretical amount of health that the Full Cure could have healed was calculated back to 7542 HP.