Should seems like we have similar conditions.....high temps and low humitidy.....Your plants look great though.....to raise the humidity in my box...before i go to work i spray the trays and the outside of my pot ( I stay far away from spraying the plant...which i think is bad...Just a fine mist all over) i do this about 3 time a day if i can.....without spraying the my humidy is around 32-38 with 3 large cups of water in the box...With spraying my humidy never really dips below 40% usually staying around 46-55%....Might want to try it....

As for the heat..im still trying to figure it out..my box with door closed is around 78-86F with it cracked open which is right under the ac duct it stays 71-82F .im thinking of installing another 120mm computer fan for exhaust and 80mm computer fan for intake...pulling from the colder air on the opposite side of my intake....

Good luck
Killa12345:thumbsup: