For the record I didn't say to set it outside the tent, I said directly near your intake. It doesn't look like you are tight on space from your pictures, so I would leave it inside but put it near the intake, not some other spot in the tent....
Lowering your exhaust speed would also increase the ability of the humidifier to increase the RH on the volume of air that is in the tent. IMO isolating your lights and exhaust from your tent environment is the most ideal situation, basically creating a sealed controlled area.