I don't quite get your story.
Are you saying that the face of the cover, which holds the rubber gasket in place is "warping"?
If that were the case, then you would have a severe external oil leak from that area.
Please post up, an image of the "warped" cover clearly showing the "warp" using a metal straight edge.
Just to be clear, are you saying that all spark plug apertures are filling with engine oil?