I know what you mean, as mine look the same way - however, I usually press the back again prior to quilting and it doesn't generally have any puckers. I press from the center out, and if there is any slack, I just reposition it (I use basting spray). I did it a little different than normal yesterday. I hung the batting, then positioned the backing over the batting - turned the whole thing around and did the top. It appears smoother doing it that way.