What I would do is measure the distance from the masthead to each side first. If the main halyard is centered in the masthead truck, or close to it, you can get an idea if they shrouds are the same length or not. If they are, then the list you're seeing is because the boat itself is unbalanced.
Please note, that this is not all that unusual, even with the boat empty, because the boat is not symmetrical in terms of gear and such. The galley and the nav station are usually on opposite sides of the boat, and as such aren't necessarily going to balance each other out.... so your boat may have an inherent natural list to it. The water tank, fuel tank, holding tank and batteries are other items that could easily cause this.
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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.