I don't think it will be a problem if you starch. I routinely heavily spray starch both tops and backing before quilting. My sister has given me some pretty wonky tops with excess fabric in many of the pieces. After quilting (I did quilt closely, less than 1" apart, with a simple looping pattern), no one would be able to tell. It also helps to use a cotton batting that shrinks. Once you get that shrinkage, even big mistakes no longer seem to show.