Well, with a 0.5 build, you may not get SUPER cloudy, although I've been known to generate some large clouds on higher resistance setups than that. It's not all about the gear, I'm not able to tolerate PG, so maybe some Max VG juice may be your answer. It also depends on your lung capacity. My kid switched to vaping very early on in his smoking history. He could chuck just unbelievably MASSIVE clouds, but his lungs were pretty healthy.
If you aren't looking for Temperature control, and just "revenge" perhaps this is a time where a Smok mod of your choice that offers high wattage (although, keep in mind, there is only so much "wattage" your coil (and your lungs) can tolerate. If you want something of better quality though, I'd say just look at a few dual battery mods and maybe ask for suggestions on the VV/VW section of the board, but many dual battery mods should be able to give you the "clouds" you seek. A mech mod CAN be set up for maximum cloudage, but it will still be limited by the topper you use and the resistance of your coil and etc., and I agree with your choice to get a regulated, larger battery mod instead and I'm sure you'll be able to get rather cloudy if you so desire. Pay attention to airflow as well, that can play a role.
But, there is tons you can do to "fog up" your current setup, not only by increasing wattage.
And, if it's a revenge issue, maybe bring something to rewick with (or another setup) once you are done with your "revenge" in case you wind up toasting your coil as you "fog." LOL.
Best of luck and please report back (mainly on the revenge issues, we are all interested now... Heh.
Anna