Just wanted to say, doing sub-ohm is not a goal in itself, and certainly not going as low sub-ohm as you can. I know guys at a local B&M who are way down there doing below .2 ohms and bragging about it, but I sure don't want to vape on their rigs. I tried a 3 wrap coil for a day with 28 kanthal running at .62 ohm, and it was too hot. I got clouds but no flavor, so I went back to a 4 wrap at .74 ohm and it was much better. The flavor was back and I was getting what I paid for in juice.
If you are on a mech sub-ohm makes good sense. I used a Protank on my mech for a while and I could tell I was just not there yet. Once I put that AGA-T2 on there with a .7ish coil on it I had arrived. It's not everyone's vaping solution, but it sure works for me and I'm pretty happy with it. Some like their Provaris, I like my mech.
It won't tell me how many vapes I did, give me my GPS location, or suggest lottery numbers, but it does do exactly what I bought it for. One button, one vape. Simple. I know what voltage I'm doing and wind my coils accordingly. It's all nailed down.