This one did the best of all of them.  Depending on wind direction, but much less so, it managed the best spreading of smoke.  There is always going to be a need to carefully level it & block wind.  Longer cylinders might improve it.  The mane problem is the metal gets super hot.  It might have to be ceramic.  

A longer, narrower exhaust pipe made it diffuse evenly in more wind, but it was still sensitive to leveling.

The 20mm diameter melted as expected, despite being made of PETG.  Creating a ceramic hot plate is the great task.

A bigger diameter than 36mm could make it heat resistant.