KZ1100 valve cover leak maybe?

I installed new valve cover gasket and end rubbers after adjusting valves. I still have a minor oil leak comming from somewhere near intake valve side of head on left side (sitting on bike) I dont feel any oil comming from rubber ends or valve cover. Its just accumulating on top fin of head. Just a pain in the ass..I hate leaks. Has anyone had any oil leak from outside most valve cover thread holes ? As these are right over leak spot but cant really tell if thats where its comming from. I feel this is literally one of those leaks that I will have to start bike and let run for hours trying to find.

check the outer nuts on the head. they have a sealing washer for the oil feed to the cams.

Pics help a lot...

I checked the torque on the outer nuts. They were fine. Do the copper washers fail/get hard at some point? I had considered that a source at one point and checked torque but that was it.

I can put a pic on here but it's just going to be a small oil spot with no obvious point of origin.

might need to go to the auto parts store and purchase an inexpensive kit with oil dye and a "black" light and some yellow glasses...it will show the leak..

Baby powder.
Steve