To me its quite frustrating to have to constantly block cancel and push attack in order to do normal combos.
Edit: Making push-attack mandatory to start every combo when dealing with horde effectively drains stamina way too fast and makes you quite vurnable.
Keep heavy overhead as is and combo it into heavy swings like it does right now
Change light overhead to the push attack instead.
light combo is just swings but can combo into heavy swings.
This would let you switch back and forth between single target attack and horde control in a much more fluent way.
Edit: as @Darksky said. it would be a dmg nerf. heavy attack would need a buff.
I also believe it would not intrude on the Crowbill’s area of single target focus.