Trinosaur
Societies are typically great parents, but definitely make sure that they are getting adequate protein and calcium. If you notice feather-plucking, add more food with protein and keep a very close eye on the one doing the plucking. In addition to boiled egg, you can give them dry eggfood, which is sold at most pet stores. The advantage to dry eggfood is that it doesn't spoil, so can leave it in for the entire time that they are breeding.
Mine like ground oyster shell for calcium, though cooked eggshell, cuttlebone, calcium drops, and powdered calcium work, too.
As far as the nest goes, the babies should be sitting on nesting material. Flat or smooth surfaces can lead to splay leg, since the chicks wouldn't be able to grip onto something, leading to their legs folding outward. Get a handful of dried nesting material (grass is good, but shredded paper towels or newspaper also works) and then put it in the nest under the eggs and babies. This can be a bit tricky. I would remove all of the eggs and put them to the side, then gently lift the babies up with a plastic spoon (not metal, it will make them lose too much body heat) and put the nesting material on the bottom of the nest. Then you can return the babies and eggs.
The parents might be a bit freaked out about this, so it would be a good idea to leave the room for ten or twenty minutes while they settle down. I've never had a society finch that has abandoned after I messed with the nest, so everything should be fine. In fact, mine even tolerate me taking the nest out for a few minutes to get photos. I definitely wouldn't recommend doing this with first-time parents, but they can get to be quite reliable after one or two clutches.
