No, the fans won’t resolve the issue. Nobody’s absorption fridge runs great on 12v because the wattage, and therefore BTU’s, of the 12v heating element is so low. It’s typically just barely enough to hold a pre-cooled fridge in moderate ambient temperatures.
When are you wanting to use the 12v setting? While driving? Do you not want to use the LP setting while driving? I have always had problems running my fridge in LP mode while driving, the flame gets blown out repeatedly.
I finally installed an inverter, and run the fridge in AC mode while driving. The AC heating element is much higher BTU’s than the DC element, so the fridge works better. Like you, I also have a DC-DC charger installed, so it can easily keep up with the draw of the fridge in AC mode.
You might consider trying that.
:):)