I'd still pull the inspection hole and take a sniff. If it smells burned in there, that could be an indicator that you are having stator issues. Primary oil is getting splashed all over the stator, and if its burned you'll know. Its a one minute inspection and could be a game changer.

Also, like Lunatic said, if you are running certain primary oils... I do remember reading somewhere that someone's fancy oil wound up compromising the epoxy on the stator which lead to problems.

Hopefully, the carbon frame covers are on your bike for looks!