OK, you win!
Hemp is a pain in the ass when wet, that's true. Manila rope is better; I've got it on my own boat. I still don't like the plastic and nylon lines. Then may be strong, but they don't handle the same when taken below freezing temps. Granted, I've never used the top quality stuff, simply because I can't afford it, and because I take trying to rig my boat using only 19th entury materials or the equivelent. It's only a little day sailer, but I try.
Sailing in freezing conditions? You are one dedicated soul!
Did you miss the article I posted about the virtues of synthetic rope over hemp for mountain climbing in freezing conditions?