I agree, been doing 3 - 3.5mm coils in my kfls and v4s, even with nickel! Btw, if you haven't tried a temp controlled kfv4 yet, DO IT!
That's all I'm running. Since finding temperature control, I have not built or run a kanthal coil yet. The only thing I have with kanthal now is my Russian on my provari p3, and that's for my wife to use since she only vapes at 10 watts.
I found the key to kayfun4 working with nickel is to get your resistance reading with the juice control open. When you have to fill it, take it off the device, close JC, fill, open the JC and then put it back on. If it asked if its a new coil, choose same.
That's for the dna40 chip, on the sx, you don't have to take it off since you've locked in your resistance
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