As a sportsman you've got to accept the referee's decisions. This get's a little diffcult if you don't understand them. So where's the technical difference between Weylin's fish-backing and Mullet's goat-rawhide? Fish-skin imho is very tough stuff, whereas with rawhide it strongly depends on how thick it is - but both for sure prevent splinters from lifting and add additional security to the bow. It was similar last time, when Pinaka's ratsnake wasn't considered as a backing and went as selfbow. In a contest there should always be understandable rules and decisions, Tom.
Thanks