Healing specials

Healing specials are supposed to heal you for a certain amount of damage you dealt, right? So if I use Wo Dao/Harmonic Lance/Wo Gùn/Refined Hauteclere/Refined Shanna's Lance/Refined Nameless Blade/Giant Spoon/Wrath, I'll get 10 more damage when my special triggers.
So if I'm using Shigure with Sol and his attack deals 20 damage, but because of Harmonic Lance his attack deals 30 damage, am I going to heal 10 or 15 HP? If I run Wrath, I'd deal 40 damage and heal 20?