My system is setup to keep the humidity in the flower tent ~60 65% all the time. But I do have 3 fans running in a 5x9. The exhaust fan trips either from temp or RH greater than 67%, so with that plus a dehumidifier it stays pretty tight.
How do you like the larger reservoir? I went to a 65g which was 14-20 days and I love it. But the hard lesson I learned was I had to watch PH drift especially in the first week after mix. If I decide to be super lazy I will add a two pump doser. Makes vacation an actual possibility.