Has anyone found the "ideal" material for a tow cord? The nylon line that came with my scooter eventually cinched down so tight it wasn't adjustable. I picked up some tough double braid from West Marine and it slips no matter how I tie the adjustable knot. A dive buddy friend whose opinion I greatly trust yesterday said double braid doesn't work and avoid paracord. Is there some type of line to use for tow cords that works best, i.e., adjusts when I want, holds, but doesn't bind up over time as it gets tighter and tighter?