Grenade regen is still too low for DPS, and the nerf to regen on kills makes it less good for add clear.
Why bother reworking, and calling it a "well deserved boost" if it's actually worse at the only thing it was actually still okay at doing and still unusable for the thing it used to be good for?
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With your grenade at 100, you will get even bigger chunks back. At 200, the fusions should be hitting like mini supers.