When my Z1 leaked it was from the valve cover as well and where the tac cable entered the engine. Put in a new gasket with APE half moon cam covers and permatex and a new O ring at the tac cable. Still have a tad of seepage but not too bad but like you it's hard to tell exactly where it's coming from.
If you are not sure where your leak is maybe you could wash and dry the engine and run your bike untill it leaks. Oil like other "stuff" runs down hill. Start looking from the top on down and where you see the wet spots start is probably the area you need to address.
On a side note where I work we do a dye penetrent test to check for cracks in parts. It's a three step process. First the part is cleaned of all oil. Second a red oil is sprayed on and allowed to sit for a bit while it seeps into any cracks. Then all the oil is cleaned off the surface with the cleaner and a developer is sprayed on the part. The developer is like a white powder chalk and draws the red oil out of the cracks. I've thought about using just the cleaner and the developer on the engine to see exactly where the oil is coming from on my bike but for now I'll wait till winter.
98% of all Harleys ever sold are still on the road. The other 2% made it home.
“I'd rather be riding my motorcycle thinking about God than sitting in church thinking about my motorcycleâ€
"Only a biker knows why a dog sticks his head out of a car window"
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