I have heard of a few instances where more than 80 ml per day was used. Check out this article that someone else posted on another bulletin board....
www.bfar.org/domperidone.shtmlMaybe that will give you information you are looking for. As for it helping your production, I really have no idea. You don't want to take too many meds, especially if it won't necessarily help much.
Sorry I couldn't be more help!