Your temps are too low. Dangerously low to the point of possible illness. Temps should ideally read 88-92 for hot side and around 80 for the cool side of your tank. How are you heating his tank and reading the temps?
Do you feed frozen thawed rats? If so, perhaps it wasn't thawed out enough. This is the reason for a lot of regurgs as well as low temps. The snake didn't have enough heat to properly digest.
And what do you mean by adventurous? Like, is he always active in his tank? An active ball can mean he's stressed. A happy ball usually likes to sit snugly in a hide.
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