I've known that RDM's Vercure is a much more capable heal than SMN's Physick for years, but the other day I realized I didn't quite know why, so I figured I'd dive into RDM's abilities and traits to find out why. I was expecting to find something like a trait with the description, "Makes healing magic 1000% more potent", but after looking through all of both SMN and RDM's abilities, I found nothing like that. They seem to both have the same boosts to healing magic (30% via traits) and Vercure is even 350 potency compared to Physick's 400 potency. My SMN and RDM have comparable Mind values — which the UI explains is the stat governing healing magic — and the same goes with secondary stats; in fact, my RDM is less geared so their other stats are lower than my SMN's. And yet, their heals do 10-15x as much.
Is there an in-game, technical explanation that explains what is happening mechanically to give RDM much stronger heals? To be clear, I'm asking about game systems, not lore! Thanks!