sailorman - I'm having the 'airy draw' problem and I also tried to use a DCT with the Vtube with NO success. (I didn't see your warning until it was too late...oopsy) I searched the LT forum for the airy draw problem but couldn't find the solution. Would you mind posting it here?
I'm one of those that needs the tight draw and really strong TH. I'm getting neither with the Vtube...in fact, my eGo-T has 10 times the TH. I'm also experiencing a burnt taste which I tried to remedy by lowering to 4.2 but that didn't work. On top of all this, there's hardly any vapor.
I'm at wits end cuz I just invested in two of these and I really want them to work for me.
Sorry, Pixel. I just saw this post today.
First, the cartos that come with the DCT tanks are usually about 1.5ohm resistance. That won't work at all.
The Vtube cuts your voltage to 3.7V, regardless of where you set it.
3.7V might be o.k. with a single coil, but a dual coil is really two 3ohm coils inside one cartomizer. So, you are trying to power two standard resistance 3ohm coils with only 3.7V.
If you use a dual coil at all, it has to be a higher resistance, like 3ohms. Then the Vtube will give you some voltage to work with.
It's better just to stick with single coil cartos or clearos with a resistance between 2.5 and 3ohms. Your included atty is 3ohms, which is ideal for the Vtube.
The solution for an airy draw I remember involved using a 510/ego adapter, a 510/510 extension, or a cone, depending on what you want to ultimately attach. If you're using cartomizers, a cone will tighten up the draw. If you're using a 510 tank, a 510/510 extension should work. If you're using a stardust, a 510/ego adapter should tighten things up. The original Stainless Lavatube thread had this info from people who experienced "airyness". There apparently some holes near the connector that need to be blocked off or restricted, and the adapters/cones did that. Someone also mentioned blocking them with toothpicks or something, but I forget the details. Might be worth a try.