Thought I'd resurrect this thread briefly just to follow up and show you all the end results. As I posted previously I ended up spraying the salami with a mold culture. I got reasonable results and every few days I was also pretty diligent at wiping any little suspect areas with a vinegar solution. It's given them some bare patches, but at least I know they're safe. They've now completed drying, lost around 40% which has given it a very nice texture. I tried it at around 25% loss, and it wasn't quite to my taste.