We use “Extron Composite” sprockets. Or Horstmans or whatever if we don’t have the “plastic” ones. They wear well and don’t seem to get hot. Also “RK Blue O-Ring” chain. Same deal, holds the lub. really well. Again with road racing, the chain lub has to last a 30 minute race. So we use “Xeramic Ceramic Synthetic Chain Spray”. After 30 minutes it’s still nice and wet.
I suppose whatever is the best stuff you can get. We clean the chains and sprockets each day of an event with WD40 and a rag, then re-lub. Messy, but it works for us.