I have a Norcold 300 and have similar issues. i have a side vent only and have installed two fans. We recently left on a trip where it was 101 with nearly 60% humidity for multiple days at home. With how my house faces sun was beating on fridge side. Temps were in high 50's after nearly 36 hours. It cooled to high 40s the first evening after leaving town. The following day I was able to bring temps down to 30's or colder but temps in 60s and not running fans.
There is no top baffle so I may try that to help direct heat. However my little fans pump a good volume of hot air out. I don't have space to add any insulation without removing fridge.