Porposing on concrete highways, Bilstein worth the $

There are certain sections of I-75 south of Atlanta I get the porpoising too. Makes no difference if I have full tanks or empty. Really annoying. It was really bad when we went out west through Oklahoma on I-40. I pulled over thinking something was wrong. When the pavement went back to asphalt it went away. I seem to get mine when I travel on concrete surfaces.