It seems like the optimal resistance to get a regulated vape is about 2.2 or 2.3 ohms. That puts you in 4-8v range across the entire 7-30watt spectrum. I did definitely notice a significant voltage drop when vaping with the ohms flashing on the screen at about 1/4 batt life left.
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Because, like a mech, your dumping straight battery voltage and not regulating and only putting out what's left in the battery....