Sorry you lost the 3 babies. But momma Lucy Lu probably knew they were weak and had problems so didn't help them out of the shells. They may not have made it anyway, even if you had been home to help them along. This is a natural hatch after all and that happens.
I keep checking this thread to see the new babyzilla's in a more nature setting. Good work, pat yourself on the back. With all the Fireants, it's sure not going to happen here.
Been thinking, you could keep all your babies and expand the hoophouse. That way come spring you would have more hatching. Then really have some for freezer camp. This could be a learned thing, now that it is started. More likely that instinct will kick in with the others setting nests. You could try for a whole flock that breeds/hatches their own. You have a good start on it.
I know that by keeping different ages of chickens or ducks, the young learn faster from the older ones and the whole flock is more settled. I do believe birds have their own language that we just don't comprehend.