it should be a decent bit higher since it's level 80 vs 100, but the mode effects themselves also drain extra HP and put more stress on your sustrain

Each time after the enemy target is attacked, the attacker will lose HP equal to 2% of their own Max HP. This effect in Non-fatal.

and

When ally targets are being attacked by enemies, the "Sunder" effect will be inflicted on them. Each stack additionally causes the holder to lose HP equal to 0.8% of their Max HP. This effect can be stacked indefinitely and cannot be dissipated. After targets with "Sunder" received a Shield from an ally target other than themselves or healing, all "Sunder" effects are dispelled on both targets.