I do mostly trail riding and my setup is a low/mid. PC Pipes , MX Port Bumped timing and compression boyssen dual stage reeds . I always read on here that 28 or 30 will give you the best low mid throttle response. That is the reason why I never considered 33,s . I dont want to by a set of carbs and be disapointed that they do not perform best in the type of riding that i do 85 percent of the time. But if I can get away wit runnin 33,s and gain some top end with my current setup then hell yeah I,ll go wit 33's