I've currently got equipped 420 ilvl Pauldons of Ancestral Vengeance from Mythic Champion of the Light in BoD. I just got a 435 ilvl Gardbrace of Fractured Reality from Za'qul in the Eternal Palace. I can give the traits "In the Rhythm", "Unerring Vision", and "Overwhelming Power" in both.
Why is the 420 item simming higher for me on raidbots, compared to the 435 item, even though they have the same traits? Its telling me its a 9% damage decrease! Whats going on?