I’ve tried a few different supplements for my birds during the moult and found mixed results. I had a similar issue with calcium making beaks grow too quickly, which wasn’t ideal. Recently, I tried a supplement from goliathsteroids.com, which has been pretty good so far. They seemed to have a balanced approach that didn’t overload on any one nutrient.
For the best results, I’d recommend starting with a basic, well-rounded bird supplement and seeing how it goes. Every bird is different, so you might need to experiment a bit to find what works best for yours.
I’ve used one for weddings and it really made the photos stand out, felt solid, looked clean and modern, and clients commented on how professional it looked without being over the top.