It'll be a while before I can get the melds finished. Exploding Meteria and all that.
In the meanwhile we can discuss build theories as far as getting the best out of Heart.
Evenflow is an interesting alternative to strenght for glove, something I'll probably want to test later as well. However I wonder if you're undervaluing Piety because you may be undervaluing the damage on your Auto-Attacks.
In all of my parses, Auto Attack is without a doubt the strongest single source of my parses, and it's effected heavily by my Piety, as well is a small percentage of my Weaponskill damage. Your build suggests minimising this source in favor of maximizing WS frequency and damage.
Looking at my critical frequency distrobution (Which attacks crit the most often.) I can see some concept of wanting to WS more frequently.
You would contest that Piety is a waste against Critical Attack in the body slot. However that's actually not where your build conflicts with other players. The contest is Piety against Store TP, by my accounting of it.
An Alternative build were to be to forego the Store TP gloves and retain the STR on Your gloves, and instead of focusing Critical Attack on your body piece, do so on your weapon instead. This would increase your Critical damage without the sacrifice of a portion of your WS damage nor the modifier on your largest single source of damage.
My basis on this is the relative jump in damage I received when moving from my AF Body to a Piety body. The AF body's additional TP gain from Invigorate is about the same amount you would get from a double meld Store TP (maybe even triple?), on top of additional stats gathered.
We could make this correlation in testing if you wish as it would save me making multiple double-melds to test it out. Not that I mind blowing up meterial, weapons, and armor left and right. (Exciting!) But for the sake of timeliness it might just be better for me to craft a Double Meld Savage Heart +1 and test AF body against Piety body once again.