if himidity is really the problem, you could get a vaporizer, i remeber my sis had one for her asthma, fill it with a gal of water a day and it just evaporates the water. you could put it under the plants have it run on a schedualed timer so u dont get to moist, i was thinkin of doing this for my vegg plants but decided it wasnt to much of a problem, alot of my leaves are skinny but they do well.