proper temperatures are 90° warm side hotspot and ~80° cool side. ambient temps should stay just above 80°.
what are you using for a heat source(s)? how are you regulating the heat source(s)? you know all heat sources must be regulated, correct? either by thermostat or rheostat (thermosat being superior). how much does the snake weigh and what size prey item are you offering?
your temps sound way too low, which could be why you're getting constant regurgitation. a regurge happens when the snake does not have the proper temps to digest. without a thermostat you're just guessing temps. you need the UTH to be REGULATING heat via thermostat so it stays at 90°.