First, I would highly recommend you watch the following video regarding the use of a backstay adjuster.
To figure out when the backstay is at 20% you'll need a tension gauge. You'll also want a ruler or some other type of marked scale attached to the backstay adjuster in some manner, or marking the line that is used by it. Once you've used the tension gauge and marked the backstay adjuster for the 20% tension level, you'll have to experiment with the backstay to find what settings work the best for what combination of wind speed and point of sail.
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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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Still—DON'T READ THAT POST AGAIN.