It's not so much of a flick as just moving the stick in time with your hops (and it doesn't have to necessarily be strictly left/right. You can actually do two or three in the same direction consecutively in order to straighten out your alignment). I think the "flicking" is more reserved for demon sliding as that seems to be a faster process, but I'm not familiar enough with it to be of any help
EDIT: Whoah. Just checked the GAF rooms and both show zero players in the little counter thing. If they reset on Saturday that means there hasn't even been a single race there in days. Ouch. Super Crack Bros. is a helluva drug.