ALL my quilts have a flaw in them. Just the way it is.
I think I've had (other than baby quilts) maybe 3 or 4 queen ones that folded EXACTLY in half, but most of them would have a crooked stitch, a block that might be off center or something like that. Nothing that's TOO noticable, but I know it's there. I usually notice it AFTER I have it 3/4 done or all the way done. I just leave it. Have never had anyone other than the "quilt snobs" that I have encountered say anything about these things.
The quilt I am making now has a flaw in it. I worked around it and it looks fine. I even showed it to one of the ladies that wants to bid on it. It's going to an auction and she didn't even notice the flaw. So, if she didn't see it, and she's one of those that's REALLY picky, then I don't see anyone else finding it unless it's being scrutinized.