What you see is exactly the point of making a contact sheet. By examining the images you get a rough idea of the exposure needed for printing any given image to its best advantage. I expose my contact sheets just enough to render the spaces between frames at the paper's maximum density. If you do this consistently, you'll soon get a pretty good idea of how much exposure, and which contrast filter to use with variable contrast papers, you'll need to print a "normal" negative. Make adjustments as necessary.