rear shock

I'm looking for a new shock, mine has a seal leak and even on it's highest/firmest setting it feels mushy. With a second rider my license plate hits the rear wheel on bumps. I know the options to rebuild it with Racetech, but I'm also interested in a clean switch with one. Please PM me if you...

Is it possible to have a seal go bad on the rear shock? It seems like there's some oily substance on it that looks like maybe dried suspension oil..??