Possibly. However. Keep it simple.
If I remember, you have heat lamps or CHE, correct?
My apologies for not going back and checking but I have the stomach bug and I am on my phone at the moment resting.
You should be able to adjust the direction/heat on those to get cool side temps up.
I have a hot side UTH and a cool side UTH but all my tanks are 6x2’ and my room temps are about 70.
Did you check the misting issue? How do the temps vary from when mist is on and when it is off?