If a 50mm stem is required to fit you..the frame is too big. Also, I wouldn't say a 73* headtube and 73.5* seat tube angle is "relaxed". This isn't to say it can't be comfortable all day long, but a 73* head tube angle wouldn't be in the 'relaxed' category.
Here's a comparison of an endurance(slack) vs more race geometry:
https://99spokes.com/compare?bikes=t...done-sl-6-2022
geometry geeks and bikeinsights.com can give you all kinds of comparisons to identify a bike similar to your Triban.