Alan,
This is a very nice family photo and you have made great progress removing dust particles with Silverfast. A proper drum scan will improve the shadow noise such as the hair of the person in the middle. It appears that the flatbed scanner struggled to distinguish between the dark hair against the lighter blue sky so it blended the two elements. This is where a drum scanner will surpass a flatbed scanner. The only drum scanners that are compatible with Silverfast is a Hell S3400 or Heidelberg Tango scanners, perhaps Aztek scanners but I don't have first hand experience with Howtek/Aztek scanners.
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