What are the cupping points for extracting sihr (sorcery) from the abdomen and chest, given that performing it on the kahil (upper back/between the shoulder blades) only alleviated neck and spinal pain?

Cupping (Al-Hijamah) is an effective remedy for blood dominance, and it has no relation to extracting magic. Ruqyah (Islamic exorcism) is the best way to invalidate magic. It is good to recite it over water mixed with sidr (lote tree leaves) for the enchanted person to drink from and wash with.