My boas very rarely use the warm side of their cage regardless if i set it to 86F or 90F. They all seem to prefer the 78-80F cool side ambient.
I wouldnt worry about the boa not using the hide. Vicky was terrified of her hide when i got her as i believe she was raised in a tub as a baby so she didnt know what hides were lol. She now uses them but its on and off. As long as the boa is eating and seems fine, i would just let it be a boa. They sometimes do stupid things. My BCL loves to wedge himself between the litter dam and sliding door and inch worm his way to the top and then go across the top as far as possible and then sit there looking down on the world haha. Ignore the hides, those were temporary hides until i got his Reptile Basic ones in.
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