Can you measure the battery voltage, NOT on the battery posts but at the furthest ends of each wire ends that come off the battery. Also do this while hitting the fire button.
There maybe a bad solder or battery contact connection causing a voltage drop.
Have you measured output voltage range? What's your lowest and highest.
Do you have all three legs of the pot wired in to the DNA board? It's hard to tell from the photo. I can't make out the 3rd leg.
Measuring the voltage at the battery inputs on the DNA gives me 4.00. The battery itself measured at 4.01.
The voltage drop seems to be as follow:
Atomizer 2.3 ohms. Measurements taken while firing the atty.
At Lowest setting on the pot voltage measured at the DNA batt inputs is 3.7
At Highest setting on the pot voltage is 3.2
Atomizer 1.8 ohm
At Lowest pot setting voltage is 3.6
At Highest pot setting voltage is 3.3
My wattage calculations are as follows:
1.8 ohm atty
Lowest setting 3.2v (5.6W)
Highest setting 4.7v (12.2 W)
2.3 ohm atty
Lowest setting 3.5v (5.3W)
Highest setting 5.4v (12.6W)
Not sure how accurate my calculations are. I'm suing my VV Gripper to measure atty resistance. The highest wattage figures seem too might to me as well.
As far as all three pot legs being attached, I'm as sure as I can be that they are and the ohms measurements at the DNA board contact points seem ok for the pot.