I don't know that there is such a thing as a lead expert, but I don't see any reason for where the lead goes other than you like it there. Put it on the top, put it on the bottom, put in the middle, or all three. It's your frame, and lead tape is great because you can peel it off and put it somewhere else. Use it where you like it.
I like to add weight to the handle on my frames. I very rarely add weight to the head. I guess if I played at a higher level I might want a little more lead up top, but for now I didn't really see much of an advantage to it when I tried it.