I just checked my recipe and after allowing the surface to completely dry for upto three days, then the surface wash is started every second day.
Mine says nothing about a humid environment. What colour is the mould. If it is orange/red in colour and is a sticky surface growth, then maybe it is on track. It if is white or black, then maybe you could restart with a strong brine wash for a couple of days, get it out of the humidity and let is dry again, and see if that gets rid of the mould.
Other than that, maybe rubbing in some salt, and if necessary, thinly slicing off the mould.
Keep us updated, and best of luck.