If I have to backstitch with fractional stitches I leave the stitch without the half of the cross on the line the backstitch will take because then the backstitch is more even.
I love backstitching because it gives to my project a real neat finish. But I do not usa e real back stitch but another stitch that in Italian is called *punto scritto*.
In backstitiching you do like this:
I have a love/hate relationship with backstitching. I hate to do it but i love the look of how it finishes off and defines parts of the project. I also change the colour of the thread as sometimes black is not the right colour to outline so change it to a more complimenting colour