Are you making sure after you stitch your first side on you are pressing it open. Then stitching the other side on. Because when you make the flying geese if the one side isn't open and laid back you won't have a good point. Ask me how I know. LOL.
I have learned that from experience. I have thrown many geese away. Now I make my geese 3dimensional and it is so much easier. I only need 2 squares and a rectangle to do them.
Hope this helps.