temperature issues are the most likely cause for regurgitations, not saying it couldn't be the feeder, but the fact you had also used the AC leads me to believe that's the issue.
Also a 150 watt bulb seems way overkill for a tank? Perhaps under the bulb was too hot so he was on the cool side but because of AC was too cool.
Get a digital temp gun (can usually find for $15 or so on amazon), those stick on analog thermostats are not accurate at all
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