It would make sense that placing the humidifier lower would give more drastic drop in rh then placing it higher. I would say it would depend on how much you want to dehumidify.
I've done candy kush and candy cheese, I love the candy kush as does everyone who tries it. The candy cheese is pretty good, it was a freebie so I'm not certain I'll grow it again. I have a deep cheese photo going and might use a clone as a mother for the future.