Hi, David;
In my Army time, I served in Arctic Norway (being from high up in Arctic Norway, it goes without saying, really...), specializing in winter warfare, and I was also member of instructor teams, teaching soldiers from other NATO countries how to survive in a winter campaign. You have done a lot of things perfectly:
Having plenty of seafood (Bacalao, pulpo, etc.) which must have helped you both with proteins against the cold as well as building muscle stamina for the daily walks. BTW: Tomorrow I will make my own bacalao up here
As for your packing list; Your equipment items into your backpack; I wouldn't have changed much if I were to stay outside fighting in a winter war. IMHO, I doubt I could have done better; would only have added some warfare items. As I see it, you were perfectly equipped for that winter walk. Well done, indeed.
I have one question for you: Did you check the weight of your backpack? how many kgs?
Edit:
A couple of tips:
Wet socks: Put each sock in your armpit at night: Dry and warm in the morning. You will smell sh!t, but you will have warm, dry socks & feet.
Wet shoes: Put them in the bottom of your sleeping bag at night: Will be warm, dry and soft in the morning. You will smell sh!t, but you will have warm, soft and comfortable shoes in the morning. Do not put paper inside: It blocks vaporizing of water. But use it before going to bed.
It is incredible how much heat your body will transmit during a long night.