I use a small 12 volt electric computer fan inside our refrigerator
It does two thing.
First it circulates the cold air evenly through the refrigerator
Second by blowing onto the interior fins it seems to allow the refrigerator
to cool better.
Don't ditch the fan, all modern home refrigerators have interior fans circulating the air.
I'm with the crowd recommending cleaning the chimney and jet, Dometic calls for that to be done yearly.
Wasps like the sweet smell of burning propane.
I also believe the mid 30ish is what your looking for. Our kitchen refrigerator defaults to 37f.