Hi Andrew,
S.s.gigliolii do have a reputation for being delicate and difficult to keep long term in captivity.
This, I think is partly due to who is offering these salamanders for sale! If they are of adult size, are they WC or LTC animals? (aren't long term captive wild caught anyway?).
I for one do not sell many adult stock, as I have invested probably four or five years in growing them on to breeding size. My advice would be to obtain CB juveniles from a bona-fide breeder that is willing to show you the parents!
Having got that 'off my chest' in my experience they are no more difficult to keep and breed than most other fire salamanders. I do keep all my Salamandra in 'semi-clinical' conditions, (not everyone's 'cup of tea'), as I have a very large collection.
They are housed in well ventilated, transparent plastic boxes, with non-bleached paper kitchen towel as substrate, and cork bark or plastic guttering for hides. I do not provide a water dish as the inhabitants obtain all the moisture they require from the damp substrate, which is sprayed regularly with 'old water'. The paper towel when fouled can be quickly and easily replaced, (preventing possible bacterial infection), and food intake can be observed/regulated. They are fed mainly on earthworms and crickets of appropriate size.
Although S.s.gigliolii are found in various regions of their native Italy, the more southern subspecies from Calabria, typically Serra San Bruno, is the most sort after, due to it's mostly yellow/orange colouration. Unlike most Salamandra, which are often more attractive as juveniles, and mainly retain their markings at three to four years of age, these animals continue to turn more yellow as the years progress.