I hear you but I just prefer to use VTC4 over anything else on the market. Better safe then sorry. It also allows me to use more than just an ni200 build on the go if I wanted to. Sometimes I carry around my Mutation X V3 with a .20ohm or less parallel kanthal coil in it.
How do you know when you are plugging the numbers in to the Ohms calculator how many watts you are using. I am assuming that a .1ohm coil running at 25J will not go over the 20a continuous that I have on my AW IMR 2200Mah batteries but how can you figure it out. How many watts are you pushing or does your watts setting in power mode carry over to the Joules mode?