I see there is a small black border around the center bird block, the flying geese row and stripe/white row, repeat that, before you add your next row. This squares off the white and stops the wonkiness. It makes that a separate row. Now maybe a row of trees blocks pointed outward or some type of traditional block with a solid fabric spacer between. I really wish I could describe better what comes to mind. (I really think adding the small black border will kick start you.)