Have a new king ultra and am in the learning how to burn it process,a couple questions that I hope someone can answer. My king install just made the minimum chimney height requirement of 14 feet,I have one 90 degree elbow that then enters a masonry lined chimney where it bends it only goes in about 2 feet and then straight up,double walled 8 inch all the way and stainless liner inside the chimney.I can't seem to get a good burn on settings 1,1.5 the fire and cat shut down after about 6 hours with maybe a third of the firebox filled. When i turn the setting to #2 I have no problem acquiring a long burn. I don't have room to replace the 90 with 2 45's to get a smoother draw,I was told to extend the chimney liner by 2 feet and that would solve this problem,does this sound right?Other than that no problems,I have yet to fill the firebox to it's capacity due to shoulder season. Thanks if you can advise.