Oil leaks

Well, I replaced the spark plug tube seals and reluctantly tightened the valve cover a smidgen ( it already has a rubber seal that I installed while doing the valve lash a few months ago ), and after a quick engine degrease and warm up, all of the oil leaks at the top of the engine are gone. I still have a few drops at the bell housing down the front of the inspection plate but much more livable than before. I didn't expect that much oil could be leaking from the plug tubes.
I did notice that after replacing the pcv valve it appears to have less seepage at the pan gasket. The old valve seemed to work fine but time will tell