Fridge air circulation

[HTF]

I have a 80L compressor fridge from Thetford and a 25L compressor chest cooler I use as freezer. The freezer will go down -20ºC on the thermostat but I feel the the frozen goods, although frozen, they are not at -20ºC. I have to remove the individual ice cream popsicles from the cardboard box for example and still, they don't freeze very hard. The fridge also, if I ramp up the thermostat, things will get colder near the back wall of the refrigerator and ice will start to form freezing stuff that's only superposed to be cold.

Has anybody experimented with forced air circulation? I was thinking about making some 3D printed diffusers attached to a small radial fan to move the air around to give all the air inside opportunity to cool. Is this a crazy idea?

 

[trevskoda]

My small table top is sealed at the back so no use fitting fans etc, however i did put vents at top so air would get round the wood at back and sides.