I would leave it because I would surely get a little hole somewhere by ripping it. What I have done to prevent this was to resort to the much maligned starch. First I put the fabric through the washer and dryer. No detergent, rinse cycle, gentle cycle. The shrinkage happens in the hot dryer from the pounding. This tightens the weave and makes it easier to work with. Then spray starch. I mix the Stay-Flo (in the blue bottle) with water following the directions for a light starch. This keeps the backing nice and flat. Then spray adhesive. I don't starch the top pieces of the quilt. (I bought a really nice spray bottle from amazon.) Meanwhile, I think yours looks fine. The back won't be seen anyway, and once it is laundered it will tighten the fibers and most of the excess will be minimal.