I am currently running the 8mm shark. Or the technora w/ vectran core. With triple fisherman’s for the termination and a 1.5" tail. After the original set I have not had any creeping out of the Shark. I purchased the pure dyneema and the poly/dyneema paraloc's as well. As you stated the other paraloc's DO NOT hold any kind of a knot. A bit of bouncing and it all comes unraveled. I spent a lot of time at the park on the ground with these cords before ever venturing above the 4ft mark. I feel very safe on the Shark. It was the only one of these cords that got off the ground. The other versions Marlin, Stingray, and, Piranah MUST BE AVOIDED. I should have brought up the knot issue earlier. Some cords just don't like knots. The trouble is the cords that hold termination knots best are also the ones that grab the rope the hardest and won't let go. If I could get a Shark eye to eye stiched my quest would be over....probably not...