Skill is totally useless on Moze. She has a ton of different ways to boost grenade refills.
I mean does anyone even use the skill?
What I would suggest is giving 10% additional Grenade Damage to each point in the skill for a Max of 30%. Along with a 10% Increase in Grenade Damage Radius per point.
I “might” consider using it then…otherwise it’s useless filler on her Blue Tree.