My wife and I use VB socks (made from trashcan liners) frequently while backpacking. We really like to use them. They keep our feet warmer, nice and moist, but not wet once. But, we hike in sandals when we're not in the snow.
Good to see that you figured out a solution for your problem. Using a cotton sheet sounds like it would do the trick, but for the downsides. I've also heard that schoeller dryskin is very good for wicking and dispersing moisture without the added weight, perhaps?
I used to wake up in the middle of the night uncomfortable from sweat building up in my nether region. A scrap of cotton fits the bill very well.
By the way, I remembered that there is a "watch this thread" doodad on the top of this thread that one may click to watch the thread. I forgot all about those.