The photo of the heavy pied is not great but she looks nearly all yellow with the red face as the whole body can't be seen from photo. Is there much green on the hen as she looks nearly like a lutino from what can be seen in photo.
These are my heavy pied cocks

Above photo is when i first got him about 2 weeks ago, his plummage is now alot tighter and healthier looking

Above is the proud father of 2 bengie reared and 5 parent reared chicks.
I love the heavy pieds and can't wait to see how my youngsters colour up
If the're constantly laying/burying eggs then i'd suggest give them more privacy, use a half open nest box instead of the nest pan and don't do any nest checks, also if your giving them live food it could be putting them in breeding overmode, if i were you i'd change the nest box and reduce the amount of livefood given, with a more secure nest box facing outwards and no inspections they should settle down to incubate. Once it's obvious that 1 bird is constantly in the nest box note the date and start increasing the livefood again about 12 or 13 days later when the chicks are about ready to hatch.
I had a similar problem with my pair constantly laying eggs for same reasons, after moving nest box and reducing live food they reared/fledged 5 chicks a few weeks ago and are starting a new clutch.