Walking foot and decorative stitches


I am working on a flannel baby quilt and trying to use a decorative stitch between rows of blocks. It is thick because there is flannel on the front and back and batting between. I am having trouble feeding the quilt evenly, it is binding and wrinkling on the back. I am using decorative stitch 109. Should I be using foot F as the decorative stitch says or the walking foot ( I have tried both)? Is there an adjustment I don't know about?
Thanks for your help. I learn so much from this group.

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