My sewing skills do not yet exist. And I do have this one now, so I would prefer to get it working right. That seems to be a pretty good difference in spreader bar width between yours and JRB. It may be a sensitivity issue, and they mention something about the netting being a little to long until some hammock stretch occurs. Maybe some stretch will make a dif. Does yours touch your shoulders at all. Of course side sleeping solves the problem, and that is wonderfully easy to do, for the first time.
I think I will go ahead and contact the Jacks.