Don't forget the other half of the system.
Our whips came with instructions that made a big deal about the lines that hold the boat aligned but cushioned to the dock. The suggested method was called (if I remember) the collapsing triangle method. It allows the boat to bounce around as it needs to but limits the front to back movement. The triangles shown in two different colors collapse and tighten over and over as the whips try to pull the boat in the direction of the two arrows. It seems to work well for us.
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