Valve cover gasket still leaking after replacement

[Bdc101]

I can't see oil on the ground, but there is some film on the exhaust manifold heat shields. When I come to a stop after the car has warmed up I can smell burning oil, and sometimes I can even see a little oil smoke coming out if the engine bay.

I did the oil separator (CCV) about a year ago and then did the valve cover gasket a few weeks ago. Still, the issue persists. I did some searching on this forum and found one person who had a warped valve cover. Is this a common problem? Is there anything else I should try? I don't have sludging issues and have verified that. I would like to get to the bottom of this. Any help is greatly appreciated. Thanks!