Well…you haven’t simplified problem-solving with this 
There’s a significant 35% difference between .93Ω/.68Ω, which if it was good at the start (~16W), after 30 puffs with such a change it will be quite dim. Something is not right with the system, maybe the atomizer turned out to be series in such a shoddy way, but it will be hard to fix remotely like this 
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