This is because of how both mods work, grenade kickstart activates when your grenade energy is fully expended but with firepower, grenade kickstart doesn’t trigger because firepower gives you a bit of energy back when you use your grenade, so technically in the games code your grenade energy isn’t actually fully expended. Im asking bungie to either slow down the activation of firepower by a second or 2 so they both trigger, or to change the kickstart mods to activate on use. Unless this is intended I hope you fix this bungie.