Lack of air flow while moving.
That 'baffle kit' you installed. WHere you having issues with flame blowing out while traveling OR did you install hoping it would cure issue with temp rises ?
It is designed to limit wind currents that would blow out the flame.
If that wasn't happening remove it.
Also need to check how fridge is installed, clearances, fan operation, baffled/closed off dead air space above fridge.
Download mfg. 'service/installation' manual for your specific model. It will have the 'clearances' that are REQUIRED by fridge mfg.
RV mfgs don't always follow fridge mfg. installation requirements..then fridge has issues and fridge mfg. gets blame
YES.best method to measure temps is thermometer in glass of water. BUT air temps fluctuating inside a fridge in transit and door NOT being opened does indicate that temps are fluctuating..
Lack of proper air flow