Death rush Onslaught Galvanic Shards movement speed issue

As title says, there is something weird happening when firing galvanic shards and killing a mob to get your onslaught buff from the ring. The movement speed bonus from onslaught seems to only apply to the movement speed when the kill is made, so when in my situation while holding and chain gunning the galvanic shards I get an extreme low movement speed buff even once I stop shooting and really start moving again. But if I just keep tapping the shoot button so my character is no longer in the slowed state of shooting/attacking he gains a way different move speed buff and I feel I’m moving the way I should. It’s increasing my speed of my actual run speed instead of the readied weapon/shooting move speed which are two completely different move speeds.

Could this issue be fixed by making onslaught an actual buff with its own buff icon? I noticed that it doesn’t actually give a buff icon. Would maybe changing the way it’s applied like it would constantly be applied like other buffs you receive from kills and then it would be able to buff the movement speeds individually as you’d be in whatever movement speed at that given second.