if you have your feed dogs down, you just judge the stitch yourself - not too tiny, but remain consistent. If you are doing in the ditch, don't make the stitches so big that they could easily catch on things and be snagged or pulled out.I have seen some excellent 'primitive' stitches that were quiie large on a gypsy style quilt. Sashiko is quite large as well.I don't think you should be so rigid in accepting any variety that enhances the quilt.I think chain stitch looks good as well.