Re: Bigger thicker clouds....
for bigger clouds, add proper chilled water with ice, and over do the coals, add 1 or 2 more then usual and you will get the biggest clouds you have ever had. (please dont do this you will ruin your session)
Or like said ealier depending on the tobacco learn how to pack each tobacco properly, by watching videos and having trial and error, in one session have small holes, then large etc and see what works best for you.
For me AF has to be packed tight to smoke well, but everything thing else i just fluff into the bowl and have random holes(not including tangiers)