Originally Posted by
PaperPrincess
I don't press my seams open, I press to one side. I am careful that one row is pressed to the right, the next to the left. This way the seams nest, minimizing slipping. Also, if it's possible, feed the row so that the loose edge of the seam on the top gets fed into the presser foot first. The feed dogs will pull the seam on the bottom butting it closer to the one on the top. It's not always possible to do this, but I try!
This usually works for me, too.
I have a much more difficult time lining up the seam llines when the seams are pressed open. Whem the wad is really thick, I have resorted to hand basting these joins to minimize slippong before machine stitching the whole seam