Can I ask what sort of coils you put in the Quadflex? I bought the kit too but haven't built anything on it yet and just using it as a regular nautilus X while I'm waiting for my building kit to arrive. Can you get a good MTL draw on it? I've only ever used the Nautilus X tank so this will be my first rebuildable and I think Lung hitting is probably not for me!
I have only used the two coils that came with the kit. I did try using both at the same time but I didn't care for it, so I am using single coil and the resistance is right about 0.75 Ohms. I have been able to get a decent MTL draw at 20-25 Watts using the top airflow cap, with the airflow closed down quite a bit. That's where I was hitting some really good flavor spots on my coffee juice. I can do it with the other (bottom airflow) cap but it's fiddly, it can leak, and I don't like the way that you have to adjust airflow on that one-it seems to work better for lung hits.