I used 5mm Yale Maxibraid (singlebraid spectra) for the lowers, uppers, and runningbacks on my 13' LOA gaff cutter with great success. I served the large softeyes at the mast attachments, as well as served the small eyes around generous thimbles alow. Great stuff; light, cheap, strong, straight-forward to splice (Mobius Brummels courtesy of the Apprentice). The service was done with waxed nylon twine, including a patch at the spreader tips. Can't say I've noticed any of the creep that Yale warns (online) may occur, but then again, my loads are pretty low. I get more stretch out of my (frequently adjusted) seine-twine lanyards.
Only real worry of mine is concerning chafe from the jibsheets on the uppers; I've been keeping an eye on them, and will likely just replace them entirely if they get to looking fuzzy, rather than play around with more service, baggwrinkle, shroud rollers, etc.
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