Hi, I use 1/2 inch Sta. Easy on the hands, best bang for the buck. No need for any shackle just use a "Luggage Tag Hitch " or "Girth Hitch" knot. There are enough opportunities for this thing to snag during tacks as it is.
I've been using the luggage tag hitch on all my foresail uses for several years. No issues. Simpler is better. :-) Here's how to do it. https://www.youtube.com/watch?v=9Z8-y0Ag8vo -Francois 1990 34/36 "Take Five" Lake Lanier, GA
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