JRB UQ and Dream Hammock difficulties

I have used my Jack's R Better Mt. Washington Under Quilt with my Clark's NX-250 for several years with no problems at all. I recently bought a Dream Hammock Sparrow 11 ft. hammock, and I spent most of the night trying to keep the hammock beneath the wide hammock and even on both sides. It wanted to all migrate to the side opposite the hammock entry side. Any thoughts or suggestions? I have no doubt it is operator error, as the only thing different was a longer and wider hammock. It has been a long time since I have gotten to do any hammock camping, so I am just wondering if anyone has experienced similar problems and how they solved it. Thanks for any help!