It's going to be a bigger nerf on larger hitboxes, but the 10% buff to F1 counts a lot for GS burst. So it might even out, especially on smaller hitboxes.
I'm more interested in the Zealous Blade change, and how much it heals now.
EDIT: There's also an unreported 33% duration increase (from 6s to 8s F1 duration now) included in the Big Game Hunter trait, so that's nice. More damage gets the 20% boost that it would have before.