I think you might be creating more problems for yourself than you will be solving by starching at this point. There are so many things that go into a puckering situation; some patches might have been too large in relation to those around it; the seam allowances not even when the stitching done; stretching bias edges when 'ironing instead of pressing; steam that shrunk one fabric differently than adjacent fabrics. The problem cannot be solved unless you understand the cause of it.