We have an old (probably 20 years) black Lopi wood burning insert that has two doors with glass panes. It has two small vents on the bottom, a slide vent across the top of the doors, and a top vent. This stove consistently pours smoke into the house, especially on windy days. Last year we put in a new liner which did not help. We replace the cord around the doors at least twice a year. It is a good stove, heats well and can hold a ton of wood. However, the smoke is a problem. Sometimes it can be seen leaking from the two bottom vents and other times it seems to leak from the glass panes in the doors. It also builds up a lot of creosote, more than I have seen anywhere else. Any thoughts?