I am basting this to the batting. Since I am now in my studio where I can measure these the scallops are 10" wide and 2" deep. I am doing an edge to edge (3/4" stipple) to try to catch the edges of the scallops. Just realized I have a can of PAMS fabric spray adhesive. I have never used it (I am 6 months new to machine quilting). Have you used it before? This might be the answer.