I use Wonder Clips to hold the seam exactly where I want it. The clip is designed not to have to be taken off to sew, it lays flat on one side. I like glue basting seams too but the clips are best when I have lots of seams to match. I rarely use pins anymore. A machine usually will feed the top layer more then the bottom layer. Hold the top fabric up off the bottom fabric until it reaches the foot. This really helps.