Just got the amnps and did the mail box mod on my gosm propane burner. I can get it burning so good it's hard to blow the flame out. My question in is how much thin blue smoke is to thin. I modded my exhaust to a 4 in pipe and when I open the door there's barely any smoke. The original vent wasn't this open at full often is it to open do I need a damper it down a little.