I am not sure but if you can also study some tribal people staying in Girnar area of Gujarat, it may also add to your study. I dont know much about the subject but since you are very very knowledgeable and doing a substatial work in this direction, it could mean further information for your study. People in some tribes in Girnar area of Gujarat are aware of certain people who look more like people from Africa. May be this be also some kind of link between India and Africa. I am not very sure as it could be only a physical similarity but its there.
