Get a battery operated fridge fan and put in the lower left corner of your fridge. Some units freeze up do to a lack of airflow, have air moving may help your problem. My battery fan will run continuously for over a month on two D batteries. There are threads where people have used small computer pancake fans with the wiring run thru the drain tube, they work great.
Either one of these will work just fine, plus your fridge may get colder allowing you to turn down the thermostat.