Mold, Dark - How Reduce Growth?

[Jlijoi]

Hey guys.  I seem to be getting excessive dark mold on my Romano and have to keep scrubbing it clean every few days. It is very difficult to get off with a paper towel dipped in white vinegar.  I end up having to scrape it off.   My Humidity level is pretty consistent at 82-85%.  I tried lowering it a bit for a few days but it was too dry and I got a crack in the rind.  Is there any way I can slow the mold from not forming as much?