Even if the coil gets beyond the vaporization temperature of the nic-goo, the goo will not continue to heat above its vaporization point without more heat input. Because the vapor is immediately pushed away from the coil (as you can easily observe when firing an atty with the coil exposed) the vapor will not get scalding hot. It's the same reason you can put a torch to a block of ice, and the ice will stay at 32 degrees until it is melted, and then the water, IF heat is still applied, is able to heat up.
So even if one coil were able to get way hotter than another, with appropriate airflow, the temp of the vapor would not likely be substantially different. Yes?
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You've got it Mitey. Great diagram! As long as the coil is wet, the coil will not get much hotter than the liquid at phase change to vapor. Having good air flow on the coil also helps keep the vapor moving and the coil cool.
Now, once the coil gets dry, all bets are off and the temperature is going up, fast. If this happens to me I fix it right away so the coil stays wet at the power I'm using. Burnt hits are not safe to vape.