If black oil sunflowers were bad, mine would be dead. That is all we have in our 7 wild bird feeders and the birds spill them. The chickens come clean up, every day. They aren't fat and some are around 6 years old One old witch I wish would die though lol.
Plus, BOSS (black oil...
If it were mine, absolutely cut out ANYTHING other than it's grower feed and make that into mash by adding water. Then alternate fresh water one day, vitamin water one day, and probiotic/electrolyte water one day.