Did you actually remove the filter? If not, isn't that too much oil? Mine would struggle to take 1.8L, even with the filter changed
My experience has been that if i fill to the top line of the dipstick, it will put it into the airbox. Bike level, dipstick in but not threaded at all - 1/2 way up is enough. My bike doesn't use any oil, and it maintains at that level reliably, and just a bit of mist in the box.