When I rip, I use an eye brow shaper. It has a covered razor blade that has openings where the thread gets cut. It won't cut your fabric. It would be a good way to rip between the backing and the batting. And it is fast.
I am so sorry you are disappointed in the quilting. We put our hearts and souls into our work and we would like our quilters to enhance that work. Before you ever release your quilt top to another quilter, ask exactly how she or he intends to quilt it. Or have a suggestion for what you would like.