I am totally lost. I make sure my backing is at least 3" bigger all the way around and float the batting and the top. When I pin it to the leaders, there's only about a half inch overlap of the backing onto the leader at the top and bottom. I stay stitch the top of the quilt when I start, stay stitch the sides as i advance the quilt, and the last advance of the quilt I stay stitch the sides and bottom. why do you have to un pin it when you get to the bottom? The area to be quilted is several inches from the leader...