Atm Tom its my fav atty but i've only tried that one build you've seen above and it could just be down to having the coil centered under the DT that it tastes so bloody good, i do also have half of the airflow shut down.
i took a shot for you to see the size comparison up to the Velocity, there isnt a lot in it tbh when you take into consideration the velocity isnt as wide on the upper part, i also have the phen with the tobh Dt in the pic to show how much shorter that makes it but then you dont have airflow, i did try with airflow all open and is a little airy but taste was still there and clouds are good.

an advantage this atty is that the airflow doesnt impede on the deck as you see below..
no doubt i will tell you how it go's with dual in stnd position