My husband is much better at optimism than I am, and keeps telling me to give it time and maybe it'll get better. In the meantime, my brain is screeching at me that Tex may experience a buildup of oil under his skin that can't release itself and die of complications from that. I'm distracting myself by looking for goose diapers. At the very least, I can be prepared to bring him inside on rainy winter days, and maybe he'd be happier on such occasions if he had free reign of the house.
With something like mink oil, were you thinking of dabbing it where the normal oil would accumulate and letting Tex spread it himself from there? I wonder if that would make his feathers better or worse? Maybe it'll be worth trying later on. He's outside during the day now and his feathers look pretty good. He's drenched after he bathes, but he stands in the sun and preens until he dries. I'm trying to be hands off for awhile and let nature figure things out for now.