One of my big improvements when I redid my roof, from disintegrating shingles to a metal roof, was to go straight up through the roof, instead of out the window with two 90 deg bends, like it was. Why would you need a 90 deg if you went through the roof? Just go straight up. I had to move the evaporator over just a few inches so the double walled stack went in between the rafters.
Good luck!
2017 - 20ish taps on buckets, boiling outside in two baking pans
2018 - 70+ taps, 14-buckets, 50+ on tubing, homemade arch from oil tank in my barn, 17 gal syrup
2019 - same set up, 20 gal syrup
2020 - less taps, short season, but RO kit was fantastic! 6 gal syrup and a maple cat!
2021/22/23 - expanded into the neighbors yards! 50 taps on buckets and 40 taps on tubing