So I'm close to answering my own question after consulting L&Es "Principles of Yacht Design" as to the size of wire; 1/4". This size (with a healthy righting moment thrown in) is right on the edge of the breaking strength with their formula which includes the safety factor. It appears I would likely be just fine with the 1/4 wire. I am still wondering, however, what advantage or detriment there might be using the 9/32 wire on the headstay with roller furling?
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