1) the radiator in this pic is unused. I used it as reference to show what I'm referring to. The color is from the heat treatment.I know I am a bit late in the day coming in on this issue, but I have a couple questions that might help you solve your own dilemma: 1) the photo implies the radiator is more gunked than the clapton... were they both clean to start? My suggestion here might be that the radiator used its heat to burn the juice on the coil... and 2) how big of a cloud did each make relative to the other? Was more juice used by one because it was blown out into the room? Maybe the complexity of the efficiency issue is hidden in the simplicity of the vape... just a wild thought.
2) This test started when I noticed that with the 30g Radiator was drying the wick much faster and made much more "cloud" than the Clapton at a lower wattage. Made my brain go
Good thoughts, keep em coming

