Try candling your eggs from underneath to get a better idea and do not rotate them.
There is only a few things you can do with moldy eggs
Elevate them so they are no longer directly in the substrate (should this be the issue), referred to as substrateless incubation.
Apply athlete foot powder or Elmer glue (I prefer glue)
After that it's only a matter of time I have hatched some eggs that looked pretty bad however they still candled good, if they do not candle good than there is nothing that can be done, it's game over.