Witch Doctor Spirit Barrage Build Mundunugu's DONT CRIT!

My Witch Doctor Spirit Barrage Build with the Mundunugu’s does no (yellow) Critical hit … but i m Paragon 700 with 40-45 % crit chance
i kill a Grift solo Boss 100 … Exemple and i see 1 or 2 Crit dmg …

but my BARB with 25 % Crit chance … on Same boss … i can see like … 50-60 crit dmg before he dies…