Scratch that... 9/32 316SS (published values ~8700 lbs break strength) is shy of the max load factor calculated so cannot be reliably considered. I've therefore arrived at the conclusion that 5/16 is the closest line that has a strength above the calculated load factor.
Scaling the mizzen by sail area gives me a good estimate of the forces at < 40% versus the main. So I will use 3/16 on the mizzen, which is handy as it matches my lifelines.
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