Andrew, I have found for the most part that fig cuttings like the same air temp we do. I would not like to wear an electric blanket all the time. Save electricity and get rid of the heat pad. Is your dome vented? About the baby figs, rub them all off, as Gorgi says, they are energy zappers. . A high humidity without overcrowding does better for me. I have no experience with the root riot cubes, but a tray holding 72 cubes sounds extremely overcrowded to me. I like a Sterlite translucent containers about 16" tall, looks like a laundry storage container with a lid available at WaMart and other stores,will give you more room an still keep high humidity. Raise and lower the lid a few times daily to keep some air movement. Early on starting cuttings beginning, I would say more die from drowning than thirst. Also filtered light is best, uses less water and keeps leaves from burning. By your pics, those cuttings are about as tight as wooden matches in a box.