leaky valve covers.. decent size leak(s)

I have bad experiences with those cheap crome covers(came with the engine). If you look those closely and compare them with orginal or aluminium, you see the difference why those can NOT work! The contact area of cover to gasket is only 3-4 mm wide compared to 6-8 mm in Mopar perf or others and the gasket can slide in the head. And bolt reliefs in the cover is not flat+too small so at every bolthole it causes that the gasket(bolt extensions) is not under pressure and oil comes out under bolts.