So I know that you’re looking to make it desirable to use it rather than staying at full Adernaline. I suggest taking a look at the two Burst abilities on melee weapons that are done “right” – Sword and Hammer.
Both these a really nice utility, Immobilize on Sword and AoE Stun on Hammer. So here is my suggestion for Arcing Slice:
Change the animation to be an actual uppercut(why isn’t now I wonder?) and add a scaling blowout to the swing. This is something unique (like Sword/Hammer) and would be really useful both for defending yourself as well as setting up kills – imagine using it on an enemy in WvW/sPvP to knock someone back towards your team for an easy kill, or knocking someone off a friend!
I can do thirty Five-Dolyak Arm Curls.
Do you even lift, bro?