No. Only balanced commercial feed with oyster on the side. But they do forage, and I know that's not what you suggest. I may just lock them up and try just the feed. And, yes,I added chicks recently from NPIP breeder. I clean daily, check dates on feed, fresh water 1x-2x daily, clean duck pool every other day, do health checks regularly.
Avian specialist says the internal laying is genetic. The Golden Comet was at least 5 years old and a rescue I'd had for about 2 years, so she was probably closer to 7 years, which is quite good for a production hybrid. The only one that gives me pause is the Welsummer. So I'm trying all kinds of things to fix it.