soot

Hi, I've made a small woodgas stove but I have a problem with it. It works well, I can boil 0,5L water in 5 minutes with 1,5-2 handfuls of wood , but it produces lot of soot, my pot's side became full of it. As I read, soot is because imperfect burning (not enough heat, or air). I used 3-10mm...