I just purchased a new Hearthstone - Shelburne. All my prior stoves have had a heavy collar that the flue pipe fit over. This stove has an angled collar that can be flipped for either a top or rear exit. The design has the pipe fitting inside the collar versus over it. I was told this is so the creosote will run into the stove. I was not thrilled with this design when I looked at stoves. I also considered a Jotul F400 Castine stove and it also had the same design. Because the collar is angled the flue pipe only fits in about an inch and it is not as tight as I would like. If I press it down really hard I can get a fair seal and hopefully the screws will keep it tight. I am concerned about smoke leaching out during a cold startup until the draft takes over. Has anyone experienced any issues with these angled stove collars?