Rich buddy, it's a freaking mess.
They shut off the intake and the exhaust to where it won't breath, then they shoot in a richer mixture to make it run, after that they put a cat on it to burn all the unburned fuel you are snorting out your tail pipe. All this to keep the epa off their backs. It is a lot more technical than that, but is kind of what happens, the left hand is fighting with the right hand.
Racers struggle to get the curve toward the upper lean all the time, that sweet spot where it is neither too rich or too lean.
Probably the reason why these bikes run well after taking off the mufflers, the AIS
and the choked chicken intake is because the curve approaches the upper lean portion, but doesn't turn over into the too lean portion.
I may be all wrong, but its my take on the whole shmere. The bike is happy, we're all happy as sex maniacs in a cat house.