hello to you i also have an rxs running everyday without any problems,but are all your carb rubbers in good order?is the tank clean?
i would have said float height was a problem but its not.i dont know what haynes says about setting the air screw
but if you google there is a definative method there cause i used it 3 weeks ago and it transformed my bike
from being very sluggish to a flyer.hope you get it sorted!