I haven't made a SAS, though it's on my very long list of quilts I would like to make. (Well that's not true - I did make a log cabin version of a SAS, but I would like to make a real one some day.) If you haven't tried vellum for paper piecing you might give that a shot. Using vellum and a short stitch length, I haven't found it at all difficult to remove the bits of paper.