Quote Originally Posted by Falcus View Post
4 mind = 1 heal potency.
I dunno if mind gives a hidden extra effect to healing though.
Mind
Healing Magic Potency
Magic Accuracy
Damage Dealt by GLA, THM and CNJ arms

-From SE

So yes 1 Heal Pot= 4 Mind

The 'hidden effect' is that extra mind adds magic acc, which can lower your resist rates (you can get resisted on cures too). The 'lowered resist' threshold is probably what is causing the flux in numbers. That and as others have said, stacking only one stat is also unbalanced and leads to less-effective gameplay.