Without a way to monitor your knock, most of this is speculation really. I see where you're coming from though. The octane booster is a waste and most of them are gimmicks or are mis-represented. If you're that concerned about it, put a few gallons of 100-octane in your tank when you get to the track.
Plus it's hot as hell today...why you going racing?
MG sucks when it's this hot out.