For Pete's sake!! Don't feel bad! You did exactly what you were told by a vet tech. If this was pulling or irritating the little one you would know it. I don't see why it cant easily be trimmed away just like bandage tape. You used what you had and kept her from ripping out any more stitches. I do believe that would have been far more harmful to her. She sounds like she is doing just fine.
It makes me feel so good to read this thread. From a very scary beginning to such a wonderful and happy ending for all the kitties. Your kindness and love is why this baby is tearing around your home and having the fun that kittens should have.
I love hearing the stories on her progress and I can't wait for pictures!! God Bless you and your hubby!!