I seemed to have the same problem when I started quilting. A lady told me to start quilting from the middle and no matter what work from the middle to the outside. She said you would be tempted to go to the edge on one side before you got started on the other side. And I found out she was right and every time I would get puckers and little folds in my fabric. But if I followed her rule I didn't have any problems. Also I like to use spray basting.