Are all of you really demanding that the increase the health replenishing power of the heart gems? If they did that without adjusting the balance of the attack powers of the girls fights would take all day.
There is a simpler and more elegant solution, introduce new a new type of card for the health gems, we've never had Heart Girls before.
And while you're at it tweak the attack power of girls somehow, I remember a long time ago that I had way more attack power, but in order to fix the balance back then you adjusted things and modified toys and added the viagra element and other things that nerfed the gains in attack power that were originally in the game.
If you can adjust attack power so that most matches last 15-20 minutes instead of 35-over an hour it might gainstay some of these more recent updates negative problems.
We wouldn't need entire decks of heart based girls though, maybe one or two rare beauties who work in tandem with the other decks so they can increase certain types of girls attack powers while increasing the percentage of healing.
Just a thought.