Welcome to the ATS Discussion Board, firstly. As for care, I could check with Orin McMonigle via his business. I know he wrote at least one article on breeding Vampire Crabs. http://www.angelfire.com/oh3/elytraandantenna/
Have you checked either the hermit crab forums or salt water aquarium forums? Both hobbies are much larger and will probably have far more experienced keepers with your species. Often tagging your species with the search term "breeding" will result in the best care information, even if you do not intend on breeding at all.