Join Date: Jun 2005
Location: New Orleans
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Do you know if it's adjustable, or are you asking us (?) I can't tell from how you describe it.
What you want is for it to be just slightly slack when you have the mainsheet cranked in as hard as you would for sailing upwind, or as hard as you would ever crank your vang down. When sailing (except maybe in really light air as mentioned, but maybe not even then) you want the leech of the main to take the weight of the boom and the pull of the mainsheet, not the topping lift.
If there's no adjustment, then add one on, or a shackle or two, until it's just slack enough.