Hell-tier bosses carry heavy Crit Resistance
Hell-tier World Bosses ship with high Crit Resistance, which means Crit Rate becomes the bottleneck on those fights — stacking Crit Factor without shredding the boss's Crit Resistance first leaves crits triggering too rarely to matter.
On Hell-tier, lean on ATK and Final DMG slots and on a Crit Resistance shred debuffer rather than chasing more Crit Factor on the carry.