hey guys, so I got a few carto tanks from a fellow ECF member and I'm trying to figure out dual coils... I know for single coils... the rule of thumb is add 2 to the coil ohm and that's pretty much what you vape at that will keep you around 8 watts. so a 1.8 coil head, would be vaped at 3.8. I'm just confused with the dual coils. I have dual coil 2 ohm cartos that I'm trying to figure out and I can't figure it out for the life of me. would it be a 4 ohm in reality? I'm just confuzzled!