You can add more cord to the Yeti suspension so it isn't quite so tight and see if that helps. Instead of hanging mine around the gathered end of the hammock, I attach it to the suspension cords that came with my JRB quilts to give me some extra lenght. This helps me.
Paul sells triangle thingies
on his Arrowhead Equipment website. Ya have to read the thread and see the pictures
to understand how they work.
I've also added loops and mitten hooks
to hammocks and UQ to keep quilts from slipping off shoulder.