Manfredi induction casting machines

I have had a Manfredi for nearly two years and have had NO joy using
it at all. I have not been successful in casting gold alloys or
silver and have found that only platinum casting is successful. I
have had many many discussions with the factory (who cannot help at
all) as well as other users and we all seem to encounter the same
problems. Is anybody out there having regular success using Manfredi
? I have tried more than 500 flasks in tests varying all the
parameters and cannot seem to get successful castings. I have
documented all my trials and even photographed them. I have tried
several different alloys, all temperatures of metal and flasks,
different sprue techniques etc etc. No joy at all. I am very
disappointed in the machine. Has anyone the same experiences?

I would appreciate any feedback.