Was your smoke thin and blue or white/grey and puffy? Might have a creosote problem. Check your therms. I personally find that if it is windy, it helps to turn my vents somewhat into the wind and use the vents to control the heat. My theory is that if the vent is away from the wind, oxygen is actually get sucked out of the firebox. Just a theory. But I know if it's windy and my vents are away from the wind, I have a real problem with low temps. Some of that theory stems from the fact that lot of professional rigs use a blower to force air into the vents. A modification I have seriously considered.