I don't always use the spray basting and mine do great with pinning. Are you pinning every 2 or 3 inches. You really need the walking foot. It makes a huge difference. You also probably need to change the length on your machine. Every machine is different. I put mine on 3.0 or 3.5. Do some test pieces to see which stitch length you like. You don't want them real tight like normal sewing. And go slow. I used to think because it is a straight line I can just take off. Not so. When I take my time my stitches are much prettier.