I did the exact same thing the first time I tried it and it didn't work. Now I cinch it up roughly half way, give or take, and it's perfect.
Also, take the PL strings on the 4 corners and tie a taut line hitch to your shock cord suspension. That will allow you to get the PLUQ to stretch all the way out underneath you and not bunch up in the center. THIS step helped me the most.
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