I'm having a bit of the same trouble regarding the dryness. I know too well we don't want things too wet, but on the other hand, the cubes do seem to dry out quickly. I've been using a spray bottle to mist them, as well as a direct stream at the base of each cube when they look light in color. I have my cubes in a try in a large tupperware container (vented) on a warm plant mat. I'm seeing buds, and leaves, no roots rioting to get out, but I haven't been lifting them out to check.