The King Set in a costume format was a bad idea from the get go. Having players be able to earn something in game that has a good status effect Is great, having that item be a costume thus nearly defeating the purpose of costumes is not.
It's clone wars, and has been for a long time, no individualism in regards to pvp modes. I want to fight in a beer cap and a usa shirt you know? but losing out on 5% on 2 valuable stats put's you behind the 8 ball. It's like the new passives, you don't need them... until your opponent has them.
I'm told you originally had this in passive form, but was bugged. Instead of fixing the issue, you abolished the passive. I propose reinstating the passive, so you can trade your king set for a passive. Let us wear costumes for looks, not pvp status effects.