A note on Divine Seal: the increase to healing will need to make it worth using over Afflatus heals. I don't think 15% on it's own will make up for a full potency heal. After 7 casts of Cure II/Afflatus Solace you'll gain what you would have gotten from just using an Afflatus Solace for example. That'd put it at needing to be around 20s duration to gain its benefit and the way the game is currently designed we aren't spamming Cure II for 20s straight to gain said benefit.

Maybe it would be better if it increased the potency of your next heal by 2x or your next two heals by 1.5x each while not having a duration. Then a lily isn't gone to waste when we're spamming DPS for 30-60s.