I wonder if you are pinning to closely. I pin 6-8 inches apart and seldom have a problem with ripples or tucks on the backs. I quilt on a Babylock Tiara, but before that used a regular sewing machine and still didn't seem to have problems with tucks. I always start quilting in the middle and work to the oursides so that it is easier to smooth any wrinkles that I feel. Good luck with your quilting.