Oh, how I hate stripped bows. There is always a a line that is not completely straight. I suggest taping the gum paste so the black line goes on perfectly straight and than removing the tape once the food coloring is dry. I would also measure out your cake so that your swag is the same distance all the way around the cake. They even sell a tool that will measure the swag out for you. Also be careful of placing borders on the top edge of your cake, you want to make sure that it is even all the way around. Remember you are better off going a little slower so you get a better end product!