In reply to dek:
Off the top of my head:
Could you try an auto-setting for denser film, such as positives or b&w neg? Or do a RAW scan?
It is possibly over-development, as slightly overexposed silver negs should not mean much. Underdevelopment actually gives better negs some times, for scanning, which is worth remembering.
Could you try a better scanner? I have a plustek something or other, and it is supposed to be good for silver negs. I tend to use C41 b&w when I think I will be scanning, though, and I am so lazy I just use the epson flatbed more than the plustek even then.
Another idea is using something like Vuescan instead of the bundled software?
Jon
Post edited at 15:26