Yep agreed, RNG all the way. I've seen this happen with a full team of 4 inc self, had one girl reach over +100% a few times but more often than not they stayed at 70%ish each tho a few times I also had one with 20-30% only.

I have now moved away from girls that are not team wide buffs as much as possible for the sheer unreliability of them on a team scale.