SE: if it aint broke, dont fix it (War)

[Chrono_Rising]

Just for reference:
Defiance at max HP no other HP modifiers active: Upheaval does 6131 damage
Defiance at max HP and unchained, no other modifiers: Upheaval does 7581 damage

All of that is according to my in game battle log. There is natural variation in the moves, neither were crit or direct hit, but 1400 damage (nearly 25%) variation is pretty large. Given that you can repeat this with unchained every time I believe the only conclusion is that upheaval somehow is double dipping on the unchained and ignore tank stance features.

Some what amusingly you can buff Fell cleave up to 901 potency with all the buffs. You can buff Upheavel up to 965.25 potency if the unchained thing continues to exist lol.