Hal,
Craig might be onto something with running it at high heat, quicker, rather than low and slow. I don’t hunt snows, my Dad did, but, they were not cleaned the day they were taken-never. Dad came home from hunting, usually late Saturday or Sunday, cleaned up, put his gear away, and mid week or so, went to his buddies to process what they took. It did involve paraffin and water, and mechanized plucking. I never witnessed it. I typically hunted grouse or pheasants with Dad’s dog when he went goose hunting. The dog wasn’t welcome on goose trips.
I would get a goose, processed with head, skin, and feet attached. Pretty sure that was the law for transporting waterfowl. I quickly learned to turn the Canada’s down cold. Unless someone I knew wanted one, and I think those birds went to sausage. They make tolerable sausage, if you are into that sort of thing.

Better luck next time. We cooked Canada’s the dog couldn’t eat, if that makes you feel any better.

Best,
Ted