Tension on the foot of the sail can help flatten the sail shape, but may or may not help with the shape of the leech. Unlike the tension of a jib car, the tension of the outhaul is primarily outwards, with very little downwards component. By moving the jib fairleads you actually alter the vector of force acting on the sail by changing the angle of the sheet. The boomvang would have more effect on the leech of the sail than the outhaul IMHO. However, if the sails are a bit older and a bit blown out, the boom vang and outhaul won't do much at all, and you really will need to use the leech line then.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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