I have not tried this with the boat, but I like the idea of using continuous loop rigging chokers at the boat end, with a more stretchy dock line spliced and shackled to it past any potential chafe points. I have used them extensively for industrial rigging work and they seem to be incredibly resistant to chafe. Also, they use some sort of super low stretch high tech fiber core, so they wouldn't work back and forth over surfaces as the load changes. They are also pretty cheap.
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