Northern Lights Auto

Just getting started with 2 seedlings. Have them in small Solo Cups with "humidity domes", which are actually Dairy Queen covers. Don't judge. I got hooked up with a 500W HID for veg and 500W HPS for flower. This is pretty excessive for a 2x4 tent, but they were free, so I'm trying to make it work. I've gotten temps to be stable at 75, but my humidity is at 10% RH. I have a humidifier going and a wet towel, but the RH doesn’t budge. I’m assuming the problem is that my exhaust fan is sucking out any moisture I’m adding. I have the fan on medium to try and control the temp. I'm experimenting with opening more vents to see if that might help. We shall see. UPDATE: I added a small clip fan to the tent. It's blowing the vapor from the humidifier into the direction of the plants. This has gotten the RH up to 20%.