This problem started for me on DMD. And it's troubled me on just about every longer ride since, Davis Double, LRRH, Mines Road... it's annoying and kind of painful.

After some research, I decided that the most likely culprit is my shoes. So I got these

http://www.teamestrogen.com/products.asp?pID=18199

I ended up getting them at Performance, because if I still have hot foot - they're going back!

V.