This is really tough. I would patiently take out all the quilting. Being that is a Broken Star, there are a lot of bias strips. The center star doesn't appear to be too far off but the outside diamonds section from the outside circle may be way off. You may want to draw a very accurate template of the size of the diamond and use that as a guide. You may want to try to do what ever it takes to get each diamond unit accurate otherwise the quilt will never lay flat. When I pieced this quilt for the then president of RJR fabric for a wedding present, that is what I did to make sure that each diamond unit was exactly the size of the template before I started put the diamonds together. I do think I have the peach calico with the hearts in case you need any. You may want to replace the darker solid unless you have some extra. I wish you the best of luck. Please feel free to PM me if you have any questions. I used the book Template Free Stars by Jo Parrott.