Thanks Penfold - I think that Huntsman (although bespoke for some else and not buttoned up) looks much better on you, so certainly worth giving the extended shoulder a try. In fact, if I were you, I would just take that jacket with me to my tailor and use it as a starting point.
Going to have to disagree with add911_11; think that Penfold is on to something here:Think an extended shoulder may be helpful. Can't find it now, but didn't you post pics of your vintage Huntsman tux somewhere here? That seemed to be a more flattering fit for you.