I've tried both G3T's item editor and PGE by itself to make potions heal 30 instead of 20, yet the item always only heals by 20 points. Changing the description and price is as simple as changing their respective values, but the healing parameter seems to do nothing. The same issue happens with an unhacked FR 1.0. I hate to use the forum for such a simple question but it's driving me mad.
Edit: I figured it out. On PGE there's a "more usage" window under the "usage" tab. That's where you have to change the value. What was throwing me off is that all the potions have a number on every item editor labeled either "parameter" or "value" that is equal to the potion's healing value. I don't think it's a coincidence but since altering it seems to do nothing I have no idea what it's supposed to be