Comparing the GSII 22mm and GSL 23mm by Shenrey, it seems the GSL has smaller holes for the mesh wick and a smaller center air flow hole. I don't own either, just noticed it the pics. Can anyone confirm that has these models?
Chimney & Feeder hole sizes for the ones I have
Hotcig 19mm
6mm
3mm
Shenray 19mm
6mm
3mm
Hotcig 22mm
8mm
3mm
Shenray 23mm GSL
6mm
3mm
What is the purpose of the upper, additional airflow? Maybe for use in Dripper mode... Because in Tank mode, when opened, it simply depressurizes it and e-liquid runs outside slowly, but surely. Maybe I don't know something? But I've been vaping this tank all day today. It reaches 65W in TC mode on every puff. I think, it could easily compete with Dual Coil tanks. IMHO
Not sure it really has a real purpose other then just providing additional/more airflow, and to offer a common path approach for use in dripper mode. The atomizer chamber is not pressurized, you have the chimney & bottom airflow which negates any possibility of a pressure build up. The tank on the other hand is supposed to be sealed and a vacuum/negative pressure is what is supposed to keep the liquid in.
In my experience the upper air flow effects flavor more @ lower power, it seems to take a bigger hit when running in the lower wattage ranges, which does seem logical to me. I normally run mine with about .8 ohm 3mm Kanthal or Stainless wire 25 watts.
Love your work on those wire posts, as well as your mods to the KF4!