Although it can be mixed I think there should only be a scarf set. CB is rather useless in my opinion. Its outclassed by every other physical attacker. While it has higher speed, it has low base power moves and its STAB move Zen Headbutt has okay accuracy. I would only keep the scarf set due to its superior speed. Good luck.

Thank you for checking my QC. I'm slightly confused why to have Fire Blast > Fire Punch. I can understand the HUGE power difference, but that would make it a mixed set, rendering Choice Band useless (if it's choice Scarf, makes sorta sense, not really though).

EDIT: Adding Thunderbolt also completely ruins the CB set; just noticed that, as it isn't mixed.