Me and a friend have a pretty big smoker that we use. The problem we are in countering is that we tend to have way to much smoke in chamber (the gray kind not thin blue kind). We have tried to shut the vent and just use the stack vent and still the same thing. It also doesn't tend to go below 300 degrees either. It is starting to make our food have a ashy after taste. What can we do to fix this problem.