What 510 atomizer do you use to vape at 7.4 volts. The HV are recommended for 3.7 to 6.0 volts.
]Leave watts out of the equation.
I don't know who started all this watt stuff.
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To vape at 8~8.5volts you need a differential of at least +2.5 volts over ohms.
so around 5.5 ohms is perfect.
+ 3 volts is ok but it's a harsher vape.
Forget carts...only dripping.
Forget 510's only 801.
Forget normally fabricated 801's
Forget any HV 801's out there.
Forget having to break in an atomizer...if you have to break it in, or any other silly excuses. It's not working.
A good HV 801 atomizer, correctly made, will give tons of vapor (cold vapor), and make a 10 mg liquid taste as if it's a 60 mg liquid.
A correctly built 801 will last for ages at 5.5 ohms, and over time will deteriorate to lower ohms values.
After 8 weeks or so you can use it to Vape on 4 volts, because resistance has fallen.