It is not bug. COV is normal spell. Better c.speed then faster re-use magic skills. So when you make Magnus before COV It shoul has faster re-use than before.
tateossian jewells are 70 %... btw i dont think it is working. Sorry but imo you just trying to reach post but who knows maybe you discovered exploit... atm I am laughing
I dont think so. They nerfed only when you are full buff and epic wearing. On "normal buff" wild magic, emp you will hit more crit's than you were making before.