Leaking aluminum Mopar valve covers!!!

I have the same problem with my Mopar valve covers. I had to notch them to fit around the intake and I have tried 3 different kinds of gaskets some cheap rubber ones, cork which were fully saturated with oil, and now the Mopar ones. The mopar gaskets work the best so far but they still leak on the backside. I never take the valve covers off except to change the gaskets. It sucks having smoke roll out from under the car when I start it up.