I also spray baste and flatten, flatten, flatten, but I do not use pins. I spread the quilt out on my cutting table every few quilting areas and smooth, smooth, flatten, flatten to keep the puckers and wrinkles out. I also use insultion boards leaning up against my wall to layer my quilt on. I just can't crawl on the floor anymore. I use straight pins to pin the back on then spray the layers. It seems to work pretty well. Good luck.