Heal Enhanced.
The goal is to make healing spells better than healing potions, whereby a spell from a given level must be stronger than a lower level one, up cast to the same level.

9 Combinations.
If you want more base heal, you can pick A or D variants. 
A is stronger: Base heal changed to 140hp. 20 hp per spell level.
D is weaker: 90hp+6*spellcasting modifier.  15+spellcasting modifier hp per spell level.
But if you have high spellcasting modifier, B is a good idea.
Also, you can pick variant that cures poison and Astarion weak status and/or
will heal 20 (A2, C) or spellcasting modifier (D2) hp more for each status that does not need to be cured.

Unlock Level Curve support.Use only one main file. Installation

Unmodded spell info
Heal is a Level 6 Evocation Spell. This spell allows spellcasters to substantially heal a target by recovering Hit Points and removing Diseases.

DescriptionHeals a target's wounds and remove Blindness and any Diseases.
 No effect on undead and constructs.

PropertiesCost: Action +  Level 6 Spell Slot
Damage: 70   hit points

Details:
 Range: 18 m / 60 ft

At higher levels
Casting this spell at a higher level grants no additional benefit.

FAQ

Installation/Updating/Uninstallation?
Anytime. This mod leaves nothing in the save.