That is a beautiful quilt. You must finish it. You are so close. Use the same seam width that you have been using for it and all will be fine. Change to the exact 1/4 inch for the next one. There are no quilt police in your house.
If we did not learn something from each and every quilt we made, and each and every quilter we meet, we would get bored with the activity and go on to something else. Every time you see this beautiful quilt finished, only you will know what you learned -- sometimes the 1/4 inch isn't all that important.