Healing Potions and Spells

Due to the high-level nature of my game, healing potions and spells, as is, are almost worthless. I've decided to tweak how they work. This should make these potions and spells useful again. 

All healing potions and spells will heal either the amount as listed in the DMG or UA, *and* they will heal a certain minimum percentage of the subject's hit points, whichever is greater.

Item or Spell Points Healed Percentage Healed

Cure Minor Wounds d4 10%

Cure Light Wounds d8 15%

Healing Potion 2d4 +2 20%

Cure Serious Wounds 2d8 +1 25%

Extra Healing Potion 3d8 +3 30%

Cure Critical Wounds 3d8 +3 30%

Major Healing Potion 7d8 50%

Massive Healing Potion 9d8 60%

Super Healing Potion 11d8 70%

Heal spell all but 1d4 100% - d4 [no change from as written]