Very nice image!
How much the two hours have to say depends on the size of the cheese. I just brined a 2 kg gouda. According to the recipe the cheese should brine 18-24 hours. In this case 2 hours is not a big deal - around plus minus 10 percent.
Your cheese is not as large (I think) - hense 2 hours is a relatively bigger difference from your target. Maybe the cheese might become somewhat salty but I don't think that the extra time in the brine is the biggest reason for the fast drying...
35% relative air humidity is extremely dry. Normally I dry my cheeses at around 85% / 13 deg. C. I think that this is the biggest issue.
Maybe you can make a box for the cheese to maintain some of the humidity?
How to maintain a brine is a science AND a religion. Some use the same brine for years while others change brine every time they make a new cheese. Personally I only use the brine for a couple of cheeses or around 14-30 days. I keep it cool when not in use and add salt after each make. I don't have a saltometer (I considered buing one) but I make new brines often and therefore I don't really need it that much).
A way of knowing how much salt is in a brine is to saturate it (all the salt that can be dilluted in the water) and then mix it with clean boiled water to make it weaker if needed.
I also add some calcium chloride and vinegar to balance the brine.
There is a lot of people in here that knows a lot more about brines etc. than I do - I hope that they can give some advice too. Just keep asking all the questions you have...
:-) Danbo