Okay so the chimney installer came today and he told me he will do a 90° elbow 2 ft above the stove through the wall thimble than a 4 foot horiizontal run to the tee. Then straight up passed the gutter with wall brackets. There will be no 30° offsets passed the gutter. He will go up 18 ft straight up passed the glitter from the tee. I think that will help with draft.