I have broken two of those curly waist leash cords. Here is a solution that I am trying. Note the addition of another of those heavy Velcro end bits to keep the curly bit of cord away from the back of the front fins.
This blog started seven years ago. In that time I have never seen or heard from anyone who surfs like I do. So if you do something unfashionable in the pursuit of catching waves let us know.