I think I have the 17lb and have had some "slinky" problems. I tie a loop in the leader connection end and attach the leader to the loop with a clinch knot - no problems there. To the fly I use a clinch knot and have had problems but have discovered that if I carefully/gently cinch the clinch knot and only really tighten it up close to the eye I lose the "slinky" effect. After a few blues the coating is chewed off and I get the "slinky" effect so I just clip off the slinky and retie. All in all I am really satisfied with the stuff.