The WM will dry out your clothes if your clothes are the right fabric. Merino or Aerowool dry out easily enough. If you plan on getting soaked head to toe, I suspect you will have a titanium stove and floorless shelter in you system? Or a change of clothes. As far as weight of a bag, when I hunt the snow months at elevation, I predetermine weight isn't an issue and I pack a heavier pack so I can survive and make it out a live and tell of my great adventures. Nothing worse than dying and not getting to brag about your adventure- sucks for the family too.
I use a WM Kodiak, with 5 oz of over fill so it is a -5 bag.
I have no issues staying warm at night, but it is hard to crawl out into the frigid temps at 5:00 AM
Winter hunts for me require a floorless and stove as well as insulated pad.