Magician %/s (KMS FLY 2 & GMS Dawnveil)

It is; also, I personally prefer using Vanquisher's Charm(Haja Rengekifu?) instead of Shikigami Haunting(Shisen Gyouha?), since with hypers, it hits the same amount of targets and its faster/stronger.

Edit: Also why go with persist on Kikyou Kekkai if cooldown cutter would have a better effect overall on it?

Kikyou Kekkai's duration and cooldown are the same. If you use cooltime reduce, you would recast it every 180s. If you use persist, you can recast it every 200 seconds.