Older model Ember Hearth insert, 3"x15" rectangular exhaust opening, into brick chimney with clay tile liner, 7"x12" inside. Existing chimney is 8' straight down to the smoke shelf, and about 4' down from there to bottom of fireplace. Stove label calls for 8" flue. Given that this is an older stove, and that most new stoves specify 6" flue, and that the chimney height is only about 12' from the top of the stove, should I: 1) direct-connect using a section of 8" SS liner ovalized from the stove to as far up as I can get it, or at least into the smoke shelf. 2) reline full with 6" SS - this would be easier but I'm worried about getting a good draft with the Ember Hearth 3) reline full with 7" SS - Do you think this would fit? Would this be too big to get a good draft on a newer 6" outlet stove PS I'm in central Indiana. I don't have the money for both a new stove and a new chimney. so I figure it would be better to put money into the chimney liner now.