The biggest mistake most people make with hymenopus is by trying too hard. Keep them well ventilated, warm, with a slight misting, maybe once every morning and evening depending on the container etc, and do everything else as you would your other species, such as pw's. The main time to make sure you keep up the main humidity is during a moult, particularly the one into adulthood. Flying insects are the prefered food and it does seem to keep them nice and healthy. Once the nymphs are large enough to take the normal house fly species, you can feed maggots with set honey, then once they have changed into a fly, feed them on sugar water. They make an excellent food source this way.
Good luck
Dave