Fold the corner of the quilt in on a 45 degree angle instead of rolling.
Example: You want to start quilting on the right side of quilt. Fold the Left-Top corner on a diagonal. Stitch down the wavy line. If/when you change direction, fold the other corner in.
I use this method for attaching binding on quilts. Fold the top left corner in and the bottom left corner in.
If you want to start quilting from center point, just fold in the Left Top corner and the Right Top Corner. Stitch down the center and move the quilt to the next line.
Hope that helps.