I had some humidity/heat problems as well, and because of that I tried out cypress too. I'm not to sure if my experience will help in any way, but here goes nothing...
Here is what I have set up, try out different techniques to obtain your numbers (my BP is in shed, so that is why the humidity numbers are high):
-my apartment heat is at a constant 80
-she is in a 30g tank away from any heat vents
-one UTH that covers about 1/3 of the tank
-thermostat *this is IMPORTANT* regulating belly temps
-one light fixture with a 100W light set to a timer for 12.5 hours a day
-bi-daily misting
-daily water change in the 9 inch ceramic bowl
-a 1.5" to 2" inch moss bed above the UTH with aspen covering all
-plastic covering over half of the top
RESULTS:
-my temp/humid numbers for my warm hide is 91-92/75-80%
-cool hide 80-87/70-75%
-ambient temp is approximately 87-90 day, 80-84 night with humid numbers staying between 65-75%.
Once she is done shedding, I will be removing all the substrate and only using aspen. I only throw the moss in during shed to increase the humidity. I can keep my normal humid/temp numbers fine with 1 daily misting and a water change (logged anywhere from 55-65%). I was having the same issue with the low ambient temps until I started running the 100w light for a 12.5 hour cycle. Be sure you are regulating that belly temp with a thermostat, mine burrows down to the glass all the time.
Also, check the numbers in your hides. Concentrate on getting your numbers perfect in the hides and in turn you may improve your ambient temp/humid numbers.
Just keep in mind what works for one, may not work for another. Keep plucking away at it and you will find a way to get your numbers. Keep a log too,(log everything) this will help out a ton in the future.
Good luck with your work and research! Hope you find your numbers soon! Cheers!