I don't own a crested (yet), but our herp society just had a speaker last week that is one of the top gecko breeders in the area. He breeds hundreds every year, and has a great success rate. I don't remember much of what he said about humidity and such, but the temp range they keep them at is 72-76 degrees.

For the Repashy, try hiding it in the leaves if you're not already. A little baby might be shy and not want to really come out to eat. Also, changing it every 30 hours might be too often. They feed every 48 hours because in the wild, their food is mostly rotting fruit. They don't have the jaw strength to eat fresh fruit, so they wait till it starts rotting. He had said that many of their geckos won't touch the Repashy until it's been sitting for two days and getting stinky.