The Nunatak balaclava should be considered as packed( it will be both worn and carried at times). I would use this with a lighter balaclava or a possum wool cap for various activity levels. Either that or a insulated hood (if something like the Belay jacket was on your list) and balaclava combo, would, I think be adequate.
Why the heavy Golite Mesh Cap? There are lighter brimmed caps out there.
A metal windscreen up close to the cookpot/stove helps to speed things up thru heat reflection. Yes, snow to block the wind is part of a Winter setup but not complete.
I meant the Golite MW baselayer ( not the Endurance, sorry) which is 7oz. Save an oz. (yay!)
Smartwool sox should be changed to a quicker drying synthetic of the same weight, like Patagonia Capilene sox.
Add about 1.5 oz. for snow baskets for the Stix.
Does your essentials list factor in sun screen/lip balm ?
Your list is almost there. ;-)>