Yes, the high (35%-40%) humidity caused problems with molting and caused the Americana to die. I have Spotted Bird - Schistocerca Lineata and Gray Bird -Schistocerca Nitens adult grasshoppers and they are doing great. I've had them for over 3 months. The Lineata are mating and laying eggs like crazy. The Nitens are slow at mating. I don't have any eggs. However, one of the nitens laid eggs on top of the soil.
@Camiezone is having success with Americana grasshoppers. They are mating and laying eggs like crazy. She keeps them in a 40 gallon aquarium and has had no issues with humidity.