Upheaval would be underpowered even if they did not nerf it down from 80%.
If I learnt anything from this game thus far, it is that skill specific offensive aspects are what make or break a core skill.
Upheaval has the hell hammer, which I own, but it sucks since it’s damage is fixed and does not scale. You are far better getting a weapon with vuln and crit.
Upheaval, Rend, and Double swing need buffs. Rend only has a ring aspect that no one end game will use to replace shout rings.