Kiwi neutral shoe polish also works great and those scuffs will disappear. Polish those rivets with Simichrome after you've applied the shoe wax. I've used a Brooks cover on all day rain ride and didn't notice it was there. Which makes me question what magical properties a leather saddle has if the addition of a nylon cover makes no difference.

My current saddle is 13 years old and looks better than other rider's saddles with 1/4 the mileage.