Haven't use the stove in a few yrs and only a year before that. Everyone says flame should be 3 or 4 inches above pot. I've tryed two brands of pellets Green supreme and Blackstone pellets. The Blackstone's seems burn hotter and taller but neither brand seems to make a flame go above the pot rim. It burns like a torch in the bottom to just under rim n just cupping the rim. All on the high setting I have the clear control box. I've played with the feed ..gotta keep it full open ..tryed blocking air in some n pellet rate on with both brands. running between 5 6 or 7 on control 7 producing best results. Have a 20ft 4in chimney that I cleaned at season beginning along with replacing door and exhaust gasket and a deep clean. What am I missing