if the oil you guys speak of, accumulates in the RHS cover...folow that tube downwards from that side of the airfilterbox.
you should see that tube to be plugged up.
unplug it, and put a catch can underneath, and plug it back up after most of the oil has dripped out.
if all this is the case, this comes from prolonged riding at about 5000rpm (with the "wrong" breatherbox.
i too still have that old breatherbox, it is said that this issue is less with the upgraded breatherbox that was replaced as a recall, but clearely not all customers got it replaced :-)

cheers, Hannes.