Have my sister in law and family staying with us for Christmas so have been starting my "overnight" burn a lot earlier in the evening so I'm not waking the kids up when I'm down making adjustments, etc. Got it tuned in after about an hour with air turned down to about 1/8 open, pretty good secondaries and stovetop around 600-650. Been about 3.5 hours now, no more flames and I'm getting a bit of smoke from the chimney. Short of setting my alarm to wake up and turn the air up in 3.5 hours, I guess I should be leaving the air further open on my final adjustment? Or does anyone else get a bit of smoke coming out too when it gets to this stage?