That's an interesting little mod there you've got....it's like the "double barrel" carto holder that allowed you to have two carto's at the same time and I reckon the way the airflow travels threw them is about the same. I am not quite sure if I understand the question here...are you asking if you can make the airflow the same with the brass connector merging the two vapes into one?
I am not sure because i have never vaped much let alone seen that mod before (but that mod is awesome, I love it and thank you for sharing
) The reason why the airflow is different is because without the brass connector when you're trying to inhale from both drip tips you don't have quite a solid seal on them and you're more than likely inhaling a good amount of air with them as well....one reviewer on youtube dubbbed this process "slipstreaming" and it's a pretty good word for it.
Slip streaming is where you inhale air out the corner of your mouth along with the vapor from a tank or atty causing you to get the appearance of more vapor from a tank or atomizer than you really are. Because you are inhaling a good amount of just fresh air with the consintration of dense vapor it thins it out a bit making it look like more and also cools it down a bit because the air you inhale along with vapor is usually cooler than the small hot coil being used to vape with. The main reason for slip streaming is to get more vapor or a cooler vape from a tank or atomizer that is a "mouth to lung" only type atty like a Kanger Aerotank or evod that even with the airflow set all the way open is fairly tight and restrictive and doesn't give a good straight direct "lung" hit like a Subtank or a RDA designed for cloud chasing.
When you put that brass cap on the two drip tips so it combines them into one you further restrict the airflow as the vape streams are combined making a thicker, denser single strand of hot vapor. This is why the pulls seems tighter and harder. Plus, since you can easily create a solid seal around a single drip tip with your mouth you aren't getting the "slip streaming effect" of the extra raw air being sucked in with the vapor that gives it that lighter, easier to draw feeling.
To get the same effect with the brass connector on as when you don't use it try opening the corner of your mouth a little as you inhale with the brass connector so you can inhale raw air along with your vapor "slip streaming" it...it takes a little practice to hold your lips open just right and get a good draw off the drip tip and the right amount of air out the corner of your mouth but it will give you and easier pull and more vapor and effectively give you the closest thing to lung hits and the "insane vapor" you're trying to get off those two little tanks.
I hope this helps...it was really hard and confusing for my tired dyslexic brain to right so sorry if I jumbled up my points but I think I got them sorted out. If it doesn't help or work or you have more questions please ask and I'll do my best to help. Good luck and happy vaping
