This is my first year with my woodburning insert. When I reload after being away all day or first thing in the morning the stove has cooled considerably. I open up the damper, rake the coals to the front and let them get up to "blacksmith fire" apperance before I stuff the firebox full. Now with the door cracked for maximum air it still takes a bit for complete combustion and I get a fair amount of smoke out of the flue for the first 5 to 10 minutes or so. Is this ok? I'm hoping the coal raking/burning is preheating the flue so the smoke won't condensate in the flue. It's an uninsulated 6" stainless in an exterior masonry chimney. I can build a smaller and initially hotter fire but it's so much easier to just load it once. During burning cycles I'm getting nothing but clear heat out of the flue.