Let's see here. As a Rune Knight and a heavy user of the Peuz Set (Thurisaz Set actually, I don't know why WP uses Peuz), I have noticed some bugs with the set.
First, with the Greaves, which should reduce Agi by 7 and then lessen that reduction by the refinement level. Thing is, the reduction is never applied and the refinement effect isn't applied as well.
Second, the entire Set effect. It was supposed to activate both Storm Blast (Wyrd/Pertz Rune effect) and Spear Dynamo during physical attacks, as well as an ASPD +2 effect, but only Storm Blast activates.
So, Oda and Camp... Can you guys take a look at this problem?