Is the screen you bought made somewhere in Asia? Try to steer clear of any parts made anywhere in Asia. Try to buy parts made in Europe or North America. Central and South American parts are usually pretty good . . . but avoid Brazilian parts if possible . . . but if the choice is Brazil or Asia, I'll go with Brazil.
When you do reinstall the sump plate, don't overtighten the nuts. If you overtighten them, you will either strip the threads out of the case or warp the sump plate. I don't recall the torque spec for those nuts, but it's just a few INCH pounds. If you don't have at torque wrench that will read that low, use a nut driver or a 1/4" drive ratchet and wrap your fingers around the head of the ratchet.
If you re-use your sump plate (or buy a used one) make sure it's flat before you install it. I keep a few of those cheap two sided (one fine, one course) sharpening stones on hand for this type of thing. Start with the course side and rub it in a circular motion around the mounting surface of the plate. Almost immediatly, you'll see the arear around the bolt holes get bright and shiny . . . thats 'cause those areas are high because someone in the past torqued 'em down to 30 or 40 times there spec. Keep going until the whole mounting surface shines. Go around it a time or two with the fine side for good measure. I use high temp silicone on the gaskets, but don't bead it up . . . I rub just a little bit into the gasket to help prevent the paper from wicking oil.