Redo the seams you think aren't perfect. Measure each seam allowance on the backside to be sure they are all the same width. With a ruler draw a very thin straight line and sew your seam exactly to the right of that line. You may have to use a magnifying glass to be exactly exact. Measure each sewn block, if they are not all the exact size you will have to start over. Being perfect is the main goal of quilting.
LOL.
If I can fudge a smidge or two and it fits, it's perfect in my book.