By your description, your C6 nerve root is functioning properly (biceps curls are equal right to left). It appears that you do not put your neck in jeopardy so the stenosis does not post a significant risk, especially if the stenosis is moderate and not severe.
A one level ACDF should decompress the C7 root and give the best chance of arm pain relief and motor strength return. It sound like you are on the right track.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.