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Survivor Tower - What determines health regen?

Heartwire

Awesomesauce
Right, I'm trying to figure this one out but have absolutely no clue.
I'm trying to figure out what is determines how much health you get back.

I tried doing high combo's which apparently seem to yield the same results low combo's do when I go to the next fight.
Does it depend on XP, FXP, or something else?
Brutalities, Fatalities, Faction kills, do not seem to make any difference either.
I know it doesn't depend on koins so you can rule that one out (I get 1900+ per match)
So yeah, does anyone have a clue on this one?