Yo, I'mma test is out today. Cause I believe it's a stacking issue.
Based on how the spell parser interprets things like Vah vs what's on the wiki:parser made it sound like insta cast spells sadly not the case
vsSlot 3: Decrease Casting Time by 55%
From deduction,Slot 3: Improve Casting Time by 45%
would mean 2% improved casting time.Slot 11: Decrease Casting Time by 98%