Damage/Crit reduction testing

The Enlightenment Protection system applies to all monsters. Regardless, 125 protection value requires at least 141%+ critical chance for critical hit to occur. I did a lot of testing which took quite long, smacked him a lot with 138-139% critical chance on Easy, never got critical hit at all. Now, I tested with 150%+ critical chance, sometimes critical hit him, but not often. When I tested with 170%+ critical chance, I scored critical hit often.

Lances with Level 9 Piercing, can make his protection value at 80, which requires at least 117% critical chance or higher.

EDIT: When I mention 70% physical/magic reduction, it is referred to 70% protection. 70% Protection = 125 Protection Value. As you mentioned "Every 1 Protection = -2% crit", it is changed in Enlightenment which is "Every 1% physical/magic reduction = -2% Critical". Why do you think Piercing Level were buffed after Enlightenment update?

EDIT2: "Critical resistance is based on damage reduction." meaning 1% damage reduction = 2% critical resistance.