Hi, I started burning my early 80's VC Vigilant this year. I have been trying to get a surface temperature of 550-700F and then switch to horizontal mode. I find that it always has some smoke coming out of my chimney when I am in horizontal mode. Vertical mode is usually no smoke after a good fire gets going. I have around 30' exterior chimney with an uninsulated SS 6" liner. I have good draft right from get-go. It seems that if I am getting no smoke in vertical mode and smoke in horizontal mode, that something is happening in the stove to create the smoke when I switch over. Are the gases just cooling off too much when I switch over? Is it ok to have some smoke in horizontal mode? I plan to check the chimney for creosote after 1 month of burning to see how bad it is. Or, maybe it's just some steam coming out? It's not really heavy and dissipates within 5 feet of the chimney top. I'm wondering if it might be better to just buy a decent used EPA stove with the secondary burner holes in the top so I don't have to emit so much and burn so much wood.