Humidity and temp controlled yes. Zone heating/ac in this house so I can keep that one room constant. Humidity is kept in check with a dehumidifier. Current room doesn't have any exhaust so to speak so I'm not sure that airflow would be an issue. I'm not messing with CO2 right now either in case that is a factor. A fan circulates air in the room, maybe it is too strong? Temps stay around 76-78 f and humidity is kept just around 45% or so. Are you manicuring your plants? Lolipopping? etc? I've not progressed that far and maybe the extra plant mass is accounting for the extra water? It does get bushy down there with those very large branches but I just made BHO from the popcorn on my last grows. I've been progressing slowly each grow so I don't get ahead of myself like that video posted above and those trimming techniques are on the to do list.
Not sure how I'm going to get my water uptake down to your levels!
And as for the fresh air comment I made... lol You do know your plants produce prodigious amounts of o2 right? Hence the nice fresh air comment, as in with 40+ plants going in that small of a space a significant amount of clean fresh air would be locked into your sealed room and combined with the weed.. it would smell nice. Gonna have to break down and hunt down pics of your grows here so I can check out your setup. I'm guessing those 40 plus plants must be little ones since one of my 6 footers was 3-4 feet wide. The math just won't work to fit that many of that size in that small of a space!