This may take some nerve and a bit of practice before the final application, but at Michael's and other art supply distributors there are pencils called inktense. You can use these pencils to darken or lighten a fabric and use a small amount of aloe vera jell or a medium to control the diffusion of the color so it will not bleed. Then use a rather small blunt brush to blend these color pencil overlays into the most obviously confused squares and hide what in your mind are the most glaring errors. Ironing the color makes it permanent. This leaves your quilting pattern uninterrupted and will make you easily understood error a distant memory. Should you fail doing this to your satisfaction, then you already have several other fall back options. How do I know this? I fixed a blunder on a very small quilt, told someone there was an error and they did not find it. There are tutorials about how to proceed...here on this board. Good luck and BTW...great quilt!!!