My cool side ambient stays around 72 and I have yet to see her use the cool side hides, she tends to stay in the middle or under the RHP on the right.

I will try adding some heat tape for now to bring the cool side up and see if she starts using that side of the tank. If she continues to avoid it I will try adding the extra RHP.

How big are your boas around 2 years old? I recently picked this girl up off of kijiji and her previous owner said she's 2 but she seems rather skinny and looks more like a round corn snake than a square boa.