This one was 3 stacked grids to try to spread the smoke out.  A cone would then try to divert it into a cylinder.

It still converged on the downwind side, even during peak efflux.  1 big improvement was a lot more smoke going down instead of up, even when the ambient air was moving.  The sealed stack of cylinders gave it a lot more downdraft.  

Another problem is the smoke coming out of the outside diameter gets sucked towards the center.  It probably needs an outer wall below the outlets to attract it to the outside.

Autopsy showed quite a bit of melting & burning on the top grid.  It's probably falling oil.  Having a longer gap might cool down the oil.

The cylinder's capability as a wind break showed promise.  If it could shield enough wind to spread it into an even pool, it could reduce the problem to leveling.  Leveling could be solved by the magnetic receptacle of the original starship incense burner.  The mane problem with that is the chance of hot oil falling on a lion paw & the cone getting moved out of position.  Another idea is a 3D printer style bed with a bubble to aid the process.