About the best thing I can do to keep my feet warm is to keep moving. I've played with various sock/liner combo's, including VBL's made from garbage sacks. My issue is that my feet sweat a lot and that too much sock or VBL will make my feet more wet.
Like everything else, there will be some things here that work for some people, and some things that don't. Get out there, experiment, and use what works best for ya!
Paul, I hope your feet get better. I had a slight case about 15 years ago, and it seemed that it lasted for 3 - 4 months.