I had to give up hand quilting but I have ripped entire pieces out, on several occasions more than once. The quilt on my bed and the one for my GD.
Usually now If I have problems, I rip after a row or so. A suggestion, do a small practice piece, say placemat size. Use cotton batting, fabric and thread. Toss in in the washer and dryer and see how it looks. I was amazed at the flaws covered or at least camaflouged by this.
Blessings,
Sharon