What is the aim of these playoffs? To see who the best is after a season?
The problem here is that we often try and split schemes up into "default" and "roping" categories. Both those categories have more skill and more luck based schemes.
We could categorise them as follows: Skill: Elite/TTRR/BnG/WxW Luck: T17/Shopper/Roper/Hysteria
Currently as it is bo5 you could say not allow more than 2 schemes in luck category (or 1!).
The combination of Roper/T17/Shopper cannot seriously determine who is better...