I have built a Ofna Lx2e, it's gonna be used for minimal club racing, or practice days and on our personal track. I see lipo advise all over, types, ect. I have a castle sidewinder 8 system installed, I'm looking at turnigy 4s 20/30c lipos or something close. What c rating can i get decent use out of? My manual says nothing less than 40c but I see a lot of people using turnigy 20c. Any help would be appreciated.