Noticed, on the first puff with skyline, it blinks "save puff", on the second it dissapears. I gave up dunno what to do, maybe worse to get the second one to try, I do love this atty.
Guess no mystery behind it but physics. All temp sensitive coils tend to change their resistance after heating up and chilling down. So then, to somehow stabilize wattage provided for the coil theres this option there. The fluctuation range will be +-25% max in case of using this option.
No point trying with plain wires cos I never use them. Even if it works with plain wire, I never use micro coils so that this feature is useless for me on DNA 75c, ordered 250c, will see.