Why do you have to hunch over? Are you trying to use a boppy or other nursing pillow? I always found those pretty useless. Get a huge pile of regular pillows of varying firmness, and experiment with bringing the baby closer to you in a variety of different chairs, beds, etc.
Also, google "laid back breastfeeding" for more information on positions.
http://www.biologicalnurturing.com/pages/recipe.html