fine (and familiar!) looking hammocks!
I have found that a pad inbetween two layers of a double body has a tendency to "ride up" the side, particularly if you're moving between on the back and on the side.
The solution is to run stitching through the two bodies to create a pocket that contains the pad and keeps it centered. You can do that even at this point, although it is a little easier done before the endcaps go on.