Ok, if I'm reading you right, you think it shrank up to much? If your stitches were tight it will cause more of a draw up, but it doesn't look to be to tight on the back. It really looks wonderful. Sometimes they will wave at you because of different fabrics, different batting, sometimes from not pressing well, sometimes just because there are different types of cotton, and well, sometimes just because they are happy you put them together.
They are so pretty, they'll be loved and washed a lot, so don't be so critical of yourself. You enjoyed making them, right?