A wild thought for balancing grim feast

I've been fiddling around with an eldritch battery/mind over matter build lately, and I noticed a key distinct difference between mana remnants and grim feast:

Mana remnant bubbles despawn after a few seconds if you don't pick them up.

Grim feast bubbles don't despawn at all until you leave the area.

Perhaps a quick and dirty balance pass that seems like it may have been intended to begin with: patch grim feast bubbles to behave the same way as mana remnants.

I know, I know, nerfbats aren't fun...but lets be honest, grim feast is too strong, and I know that because I would never play an energy shield setup without trying to make room for it, as it currently stands.