yeah i've seen those, and i've used them at 6 and even 7.4V but i like a warmer and stronger hit than i think you might be looking for. 6.1 ohms for the i7 seems a bit extreme, even at 7.4 but especially using it 6V. but 4.4-4.6ohms is like the i6 atty, and the closest to vaping at a resistored 5V with a 901. if those i7 numbers are accurate (6.1 ohms), it wouldn't be any different than a standard Joye 510 atty at 3.7V. if that setup is a little too cool, then you probably are in the 5.2 ohm, 6v, 6.9/7 Watt range. you'll find out soon enough though; hope everything works for you!