Somehow I missed this thread. Wow, LB! Very nice looking winter-beater sock. I really like all the features you built in, especially the floor and the side snuggers. Glad your initial tests are positive. I'm going to have to make another sock.
Concerning the condensation...Do you have a way to measure the humidity in the sock as well as temp? I'm wondering if having the sock fit looser is allowing for any humidity to equalize to a lower concentration before it can condensate. With less space inside, snugged up to the UQ, the humidity is at a higher concentration. The frost bib helps because it traps the water keeping overall humidity inside lower. Make sense?