ManiacQuilter2

Our church leader and her husband recently bought this type of long arm machine to expedite the charity quilts we make. He is enjoying quilting and probably looking at it as a power tool. I received this quilt back and when I was about to trim the quilt to attach the binding, I noticed the extra fabric on the quilt top. I am curious, do you usually stitch along the edge to keep the quilt in place? I am at a lost as to how to proceed with have tucks on the quilt top when I attach the binding. This is unfamiliar batting to me. It seems like a densely polyester batting. I usually do my my binding 2.25" and wonder with this batting if I should increase to 2.5"?? Any suggestion will be deeply appreciated. THANKS!!