Right as I started rebuilding WHIA, I realized my goal had been achieved. My loft was now within 2 degrees of my main floor at all times and humidity was flat across the house, excluding the basement! What was the magic bullet you ask? I killed all of the return vents on the main floor forcing return air to only come from upstairs and then installed a 70 inch (!) ceiling fan on the main floor pushing air up into the upstairs. That took care of it, WHIA is still doing it’s thing, but it’s pretty much just running all vents wide open all of the time now. Somewhat of a let down to be real honest. I still have all of the parts and would still like to move on to v2, but it’s hard to say when that is going to happen now.