Hi John,
Though I have some small Harken winches, ever since my winch handle went deep-sea diving and never returned, I've sheeted in by luffing, using the winches only as snubbers. Though my stay'sl is smaller than yours, my most-used jib is 300 sq feet. Even a smallish 2-speed winch has enormous mechanical advantage--as long as you can get enough wraps of line around the drum, you should have no problem sheeting in with #10s.
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