Then just measure the flat length, take 83%, tie loops in the end of some cord at that overall length[prefz is amsteel for no-stretch], and loop them at the place where your suspension departs the fabric.
That will give you the right amount of droop. Hang so that that cord "just" twangs, and try for a 30% angle from the trees to the ends.
You should be as good as it can get!
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