If you take one end and turn the curl by 90 degree then push this turn through the whole cable the curls will be much tighter. Don't know how to describe it, I can look it up if you don't understand.
https://www.youtube.com/watch?v=gE6d2ZaTWwk it's the second part of this 50sec video. It will look even cleaner than in this video, because your cable is coiled neatly already.