Makes sense. I will change to SS round wire 24Awg and will go for about 35-40WIf my calculation is correct, for your build and desired wattage, you need approx. 5.7 - 6 volts supplied to the coil.
For that you need some kind of voltage regulation on your mod (like on Tesla Invader 3 or Noisy Cricket v2). Otherwise you would have to change your build for the pure mech (to find the new "sweet spot").
With your existing build you will get approx 10-16 watts with parallel setup, or 41-64 watts with serial setup (lower numbers are for the depleted batteries).
Not sure if this helps or just causing confusion.
You can use the following table for the calculations:
View attachment 190168
Steam Engine can help to predict your coil behaviour (esp. the "heat flux" field).
http://www.steam-engine.org/coil.html