No good way to remove said advantage. You can't just stop people from sparring altogether because of that, it's just inherent. It's been here for 15+ years and I don't think it'll change soon. The ping fluctuation detection is a good idea but like Crono and Thallen said the server isn't stable enough to handle it. That would be the most optimal solution to the problems we see instead out outright stopping delayers from sparring.