I was having the temp problem as well, Not so much humidity. My set up is almost identical to yours. After doing some searches and asking some questions (on this site of course). I decided to move my girl to a tub, with UTH for a heat source on both ends. Hopefully ill have it all setup Monday.

Also, I found, insulating the out side of the tank helps a lot. I just waded a blanket in between the tank and the wall. I used what was hanging out to wrap the ends. I also added some cluter. I guess it absorbs and holds the heat. Again seemed to work.

Sent from my SCH-S720C using Tapatalk 2