I'm not familiar with KAQ, but I've had (and sometimes still have) similar problems with my full length Hammock Gear UQ. My underquilt can slide up or down on the shock cords. This is great for easily getting the quilt in the right position, but it also has its drawbacks, because the weight of the quilt pulls it to the lowest point and opens gaps. I fixed it reasonably well by attaching additional shock cords to the head and foot end (my quilt has loops for this purpose), and clipping the shock cords into the s-biners. This prevents the quilt from slipping down.