Try stabilizing the entire quilt sandwich by bringing it under the needle at or near the center of the quilt. Then SID from the center out to the edge of the sandwich. Next, bring the quilt sandwich BACK to the center where you started and SID in the OPPOSITE direction to the edge of the quilt.
Continue this procedure where you can in your blocks or rows. Then, begin with any other quilting pattern you want. I do it this way and never have puckers 'cause the fabric no longer slides.