The pan is directly over top of the burner.  The thing is like this heavy cast iron box. I swear it's 1/2 in thick. I'm wondering if that had something to do with it. The wood is burning, when it stopped smoking I pulled it out, they are charred, but they don't go down to ash.  They are like pieces of wood charcoal almost. 
This is a question I was wondering, when I turn my tank on, I'm opening it up all the way, are you saying that you just turn it to barely open it?  I only had my vents open a crack.