Sorry to hear that Tim, Have you checked the oil returning to the tank, I would not think it's wet sumping,
After a run.
If it's got old type Rocker feed bolts, You could try or check that they have the small wire in the hole ?,
We were playing with a Twin some time ago, That didn't smoke bad, And Brother Ron changed the oil feed pipes and thought he would take the wires out, Next time we started it , Smoked like hell,
So we put them back in !!.
My poor old Comet is a Smoker, The only way I can ride it is with single grade 50 oil, Been doing it for a few years now, I don't go far !, I don't want to strip it out unless I have to.
I hope you are not running yours on very thin modern oil ??.
Good Luck, Bill.