I find if I needle over just a bit it helps with stitching in the ditch. I like mine right in the ditch. If my eyes get fatigued ... a use the seperptine stitch on alot of quilts.... it is the most forgiving stitch you can use! Sometimes my eyes just can not take alot of Stitching in the Ditch.
FYI there are walking feet that have a Stitch in the ditch attachment.... its a beautiful thing to have .. makes a lot of difference.