If possible, I would not worry about the exact-ness of the cross hatching. I think it is more important to have it line up with your patchwork. for example, I am quilting a quilt using straight line quilting close together. I am primarily concerned about the lines hitting the points of the flying geese and if the other fill-in lines vary slightly in width, its not too noticeable. I would stitch your main lines first to connect the target points, then you can "fudge" the in between places and even them out as much as possible.