I am guessing you will get some recommendations for the Healthy Rips Fury2 & Fierce here, but I own neither as they both either have an internal battery or proprietary battery both of which are no bueno in my requirements.
While not very pocketable, I like the Splinter vapes which reaquire a Box Mod, 18650 batteries and a charger for big clouds. Big clouds require lots of power to produce, especially if using merely convection. Many of the pocket vapes out there are fighting an uphill battle with physics to carry enough power to create those big clouds you are looking for.
Edit: My IQ has been gathering dust too, I find the draw restriction and the heat the unit puts off excessive.