Hey bro. Nah it's fine. I got away with 5 autos in my 70x70 and 1 of them was nearly 200g dry.
About your dehuimifier. If you set up your intake as an exhaust it'll draw in the RH from the room. It'll give you space. Anything below 60 is fine. It won't affect potency or anything. As if you are bringing in AIR from your grow room you'll be better using your dehuimifier in the room as a dehuimifier only works if you hv a sealed tent.