We had a skipper from Foss Tugs speak at our yacht club and he said for the Sampson Line that they use for tows they take up the load then ease back to drop the line in the water to cool it. He also said they scrap the 8 inch line after 3 months of use. Quote from July 2011 article on chafe "The best anti-chafe material to rely on in a storm is the one that resists abrasion, doesn’t cause heat build-up in the line, and can be easily installed—even if the line already has been deployed. Practical Sailor tested five commercially..." All kinds of hazards out there Charlie I'm just saying to be cool and stay cool.