Why do you want to use sub ohm coils?
IMO someone is going to get themselves killed messing with that stuff! The industry has bent over backward with protection circuits and other safe guards to make vaping as safe as possible, and now just because someone came up with the idea that sub ohm vaping is the "cool thing to do" everyone wants to jump on the bandwagon even though they don't know a damn thing about battery safety.
It's just plain stupid, and not in the best interest of the vaping community. Someone is going to get hurt, it will become the talk of every news media around, and every person that vapes will have to live with the consequences.