Dometic Fridge not cooling properly on LP mode

A new 2 stage regulator is about 26 bucks online. Worth a shot. Did you observe the flame after you cleaned everything? Was it burning higher and blue?

Curious, was the spiral baffle sooted up?

You cold have a partial blockage of solidified solution in the tubing. Only way to eliminate that, that I know of is replacement of the cooling unit or remove the fridge and invert it a couple times to get the blockage out and the slug back in solution... both tedious if that is what it is.

Good luck