when I baste for hand quilters I generally do a 4" grid on the quilt for them- this is what was requested from me the first time I was asked to do it 10 years ago and the way I've been doing it every since- I load the quilt as normal- set my speed to slow- and drive fast (
) . making large basting stitches across the quilt from one side to the other- then I unload, turn & reload to again stitch from side to side creating a grid.