Several years ago I built a large face frame fo a built in cabinet. Clamped it well and when done it was flush all around. Came back the nextday and every joint was misaligned a couple of thousands. My fingers could feel it and it was noticeable upon close visual inspection. What amazed me was that it was every joint and uniform. Took it apart and reassembled but this time with a small amount of glue. Problem solved.