Look at this.
You might notice something there. If you don't, I will point it out to you:
I have, over the course of a random heroic, tried to do the same amount of healing with as many spells as possible. That screen shot is from one of my first attempts at this, and I have since added more spells (okay, only Prayer of Healing) to the list of things I'm lining up and also succeeded in making the differences between individual spells smaller.
Once I've perfected this, I might just glyph Dispel and see if I can work that into my little game, too. And use Holy Nova when appropriate. I find AoE heals very difficult to use if I want to achieve my goal since if everyone does take damage, they end up 7% above everything else.
Crazy OCD bored Kali out.