I am an XXL and wide shouldered large chap so have tried on the likes of Mountain Equipment Lhotse which is too tailored for me.
I think you probably need to try some different brands for fit. Mountain Equipment has two fits: the Lhotse is their ‘Alpine’ cut and is very trim, but there’s also a ‘Mountain’ fit, which is more forgiving. The Changabang definitely uses it, not sure what else, but the web-site will say.
Rab has started using Gore-Tex this year and seems to have a more generous cut than ME based on the Ladakh anyway – it has very long sleeves. Discounted Arc’teryx from Sportpursuit would probably sort out the shoulder issue if they have your size. The Berghaus hill-walking cut as opposed to their Extrem or Mtn.Haus designs might work. Marmot maybe.
Do you have to have Gore-Tex? You’ll get more bang for your buck but the same features, cut etc with own-brand fabrics from Rab or ME. Gore stuff is super thoroughly tested and works well, but over the last five years or so, other fabrics have improved a lot and engineered PU membranes can work really well.