I only had S.salamandra, once, for a very short time after they were given to me (long story) and even though i still think they were WC(or LTC), they ate frozen bloodworms like crazy (which was brilliant since i had little else to offer at the time). The adult one would eat half a cube in one bite.
Hand-feeding can take some time to work, but it´s not difficult to get to that point...most animals just require a few failed attempts until they accept it. It is very handy to have your animals used to hand-feeding but if you can offer lots of live foods, then there´s no much point in offering dead foods really.