same here. 2011 bike.
it wasn't leaking from either one of the cam sensors (though i still replaced the o-ring), it's leaking from the valve cover gasket itself. never noticed a drop of oil on the floor, but the front left engine area was all gunked up with oil and sand.
i replaced the valve cover gasket with a light coating of high temp sealant on the inside of the gasket.
i was expecting the cover gasket to be in an "n" shape all around the gasket, but there are areas where there are gaps in the "n" shape facing the inside of the motor. maybe that's where the oil was pushing through.
this time round if it keeps leaking in the same area, i wouldn't bother anymore till the next valve check. too much trouble to get in there.
Ordered parts today finally. Was poking around looking through vents and noticed oil all over the left outer exhaust bolt, motor on the same side. Looked at fairing and oil has been dripping inside and running out the vent hole down by oil filter. Hope it's not a major issue. Don't want more headaches