Dale Earnhardt Jr. believes one track adjustment could make for better NASCAR racing at Richmond Raceway. The comments come following last Saturday’s Cook Out 400 at the 0.75-mile Virginia short track.Earnhardt Jr. proposed that Richmond Raceway add sealer to the track’s surface, a chemical compound designed to change tire traction or seal the racetrack’s surface. With that adjustment, Earnhardt Jr. believes Richmond races would be “amazing.”Ear…