Don't be nervous. Mold generally likes damp, and cooler temps. Mold in the 60s is far more likely than mold over 75. Then factor in the RH and air movement. If you keep fans on, and your RH isn't above 70s in veg, and you have your temps in the 70s well then there is very little chance of getting mold brother. Gramps is running RH on the low side so he really has nothing to worry about. I was spraying my plants in veg 2-3 times a day (light mist) during veg....but then again my RH was only in the 16-20% range so it welcomed any dampness.