I carried spare liners, gloves and base layers which were largely unused.
I found a good way to dry the boot liners was to hang them up with a bottle of hot water in the foot section overnight, which drove moisture towards the outer surface. In the morning this could be brushed off as frost and the water in the bottles was usually still liquid inside the liner.
Vorthas, similar to thin puttees were invaluable as was a stiff brush for removal of snow from outer clothing.
Apart from nights spent in Quinzhees I used a poly cotton tarp for shelter the rest of the time with an additional plastic tarp as a weather sheet.
On future trips I will give serious thought to just using decent plastic tarps for their ease of shedding snow.
A combination of down inner bag, synthetic middle bag with a moisture permeable bivi bag worked well but I also had a micro fibre towel that was sewn into a “snood” which absorbed a great deal of condensation from my breath instead of letting it get into the sleeping system. This was then easily dried inside my clothing during the day.