It sounds like there are two separate issues, one, you may have a gifted child and two, you are concerned about his feeding pattern. I think trying to correlate the two is what is throwing people off. And I realize that you did not do this on your own, but that some doctors seemed to have done this for you. I wanted to chime in because I was also told when I was at a lactation consultant's office, that my first son was possibly "neurologically advanced." Gifted. My LC said that there had been a study that showed that babies who arch their backs away from the breast while nursing could be gifted. Yes, it sounded odd, but yes it also stuck in my mind and intrigued me. However, the LC did not cast me off and say that was the reason, so there, we're done, good luck! She helped me come up with a solution. So, shame on the doctors who have left you floundering with no answers.
Of course I was also intrigued by the possibility of having an advanced child...he was my firstborn and what great news that was! But, know this now, you do open yourself up to snarky comments if you EVER say you think your child is gifted, but I understand why you mention it and why you are interested in discussing it. Here are my two cents on both matters:
Gifted....maybe, probably? but at this moment it doesn't matter. Knowing that your child is gifted doesn't help you feed him :) Nurture and teach your child as he leads you. Knowing or not knowing if he is gifted doesn't change anything in your life until you are considering schooling.
Feeding.... I'm glad to see someone finally brought up Reverse Cycling. Read about it and see if you can gather some insight http://www.kellymom.com/bf/normal/reverse-cycling.html
Hang in there! It will only get easier as he continues to grow and develop.
PS> wouldn't this mama be better served in the breastfeeding board? seems like a nursing issue more than a gifted issue to me.