What? 0.4 ohms??? That is nearly a dead short mate. I wonder why it did not blow your bat or explode it. It surely should have. If you have a 3.7v bat and use a resistance of 0.4ohms, you will pull 9.25 amps from the bat. My 220v fridge is 5.5 amps for goodness sakes. You seem to want a big hole in your face mate.
The lowest you can go is 1.5 ohm for any bat. That will pull just over 2.5 amps from a 3.7v bat.
I
vape at 3.4v with a 3 ohm coil and get plumes of vapor and good TH. If you want more vapor, go for more VG in your liquid.
Remember this. V in VG = Vapor. P in PG = Punch like in TH.
Now stop being silly. Your face looks good enough on your avatar so don't mess it up.