I was on here not to long ago complaining about my quilt puckering.I can tell you I don't
like using that walking foot but I did and I did lengthen the stitch a bit to much but finally got it done after a lot of ripping out.
Some times I wonder it the material it self has anything to do with it.
I posted a picture last week on the finished quilt.I washed it and it did fine.My daughter took it home.