What?! On what planet? :ask:
I've always put the slow side (side with unburned leaf/filler/wrapper) to the top.
the theory is that;
Heat rises, so it will then encourage the combustion of the laggard side. I have always experienced this to be true.
I have also always experienced that doing the opposite move will exacerbate the problem.
Sounds like we need a poll...
Regards, Dafiddla