I want to add alittle about what I have learned over the years of building manifolds and such.( even worked with a Nascar team to help them)
Consider the length and diam. of the tubes used to create a vortex, changing those aspects can have a dramatic effect.
I have considered this idea but creating a velocity stack and venturi also just never had time, consider the intake tube and consider the idea of groves inside that tube to create a "spin" from air entering even a stack on incoming side and that can help create a venturi. Also consider that the air coming in is only as effective as air going out....Don't forget both aspects of this design, Focus on air coming out as well because if it creating positive pressure in the tank it could do more harm than good. Keep in mind that you do not have to pull air from the side but also you can pull air from the top and suck from the side directly from the coil....that has what I have been working on for a new design. Try pulling from the drilled air hole with no drip tip in top and tell me what you think, it is hotter but the flavor is amazing. I have a great design but will not give info for it will be cloned in no time so just use it for my own vaping... Strapped