God, please no.
If anything reduce the casting time by a fraction of a second or put the last tick of damage just as the animation ends to remove the need for weapon stowing. The fact that you have 3 strikes makes it possible to at least hit 1 or 2 when you're moving in a PvE environment. It's such a satisfying ability to use and properly place. If you really want to reduce the strikes make it at least 2, but not just 1. What's the point of it being a Primal Burst if it's the same as Arcing Slice?
You just revived Power Berserker and it's freaking great. Don't kill it again. Please.