BP Tub Not Warm Enough!

[Cassiopeia]

Hello, I'm new to this forum (this is actually my first post)! I got my BP Cassieopeia about a month ago. I have her in a 44Q tub (which I know is big for her age however I filled it with a lot of foliage and she seems to really like it ). However I have a couple of concerns. I have a Zoo Med Repti-Therm UTH at 8 watts but it virtually does nothing. After some research I am now finding out that it is terrible. I'm going to get a different, bigger and higher wattage UTH and keep that on the warm side and the small one in the middle. I have a thermostat with a probe and have been checking the thermometers and the temperature is currently at 70!!! I am freaking out because I'm worried she is too cold and don't know what to do in the meantime. I have a heater in the room that I'm using to heat up the room her tub is in. I wanted to know if anyone had better suggestions on what to do? I also find that my humidity gets pretty high (70-80%) and wanted to know if anyone had any suggestions for that also? Thank you so much in advance, any advice is appreciated!!!