An alternative method is to use Sticky Stabilizer, following all of the steps below:
1. Hoop only the sticky stabilizer.
2. Position fabric or garment to be stitched on top of the hoop.
3. Place tearaway stabilizer underneath the hoop.
4. If your machine has a Baste In the Hoop function, use that process to Baste the layers together.
5. Lower the top tension of your machine a notch or two. This will allow the thread to lie more smoothly on the fabric and reduce the size of the holes the needle makes between stitches.
6. Slow down your machine speed, 1 stop from its top speed. The stitches will be more even at a slightly slower speed.
After following all of the above steps, if you continue to have trouble getting the Backstitch outlines to line up with the cross stitches, you might want to use Cutaway Stabilizer under the hoop (1 or 2 pieces) instead of Tearaway. Sometimes these very fast-stitching machines will almost "cut" through the Tearaway.