I decided to try the fill stitching before stitching the outline.
As the bobbin thread ran out, I needed to fill a new one. I bought more of what I thought was the same type, but the new bobbin created all sorts of tension problems – see below
See the white bobbin thread coming through? And the outline stitching is a bit raised. However, all is not lost. I now know that I could use a slightly different shade (from the needle)Â in the bobbin, change the tension settings and the fill stitching would be mix of both shades. Plus it is easier to stitch the outline last.