I tend to coil my 50a cord into the electrical bay as is naturally wants to coil, and take it out in the same manner. It means a bit of coiling/uncoiling, but it works for me, and does not seem to induce any stress on the cord.
I understand the gaffers technique of over/under, but have never been able to make it work successfully without abusing myself.
I've been offshore sailboat yacht racing for 40 years and for more than 35,000 miles around the world. We are careful how we coil lines by bringing the coils together without inducing any twist. We also occasionally drop the lines overboard to untwist the lines with the yacht's motion through the water.
I've designed mounting anchors for rope braiding equipment for lines up to 9" diameter, and 1,000,000 pound breaking strength for oil tanker towing bridles. Any induced twist is a really, really bad thing.
