Ah I see what you mean with higher armholes. I have another leather jacket (nothing fancy, from a local brand) and while it is way more loose I have similar restrictions when raising my arms, i think that's due to the high armholes.
However the biggest problem is the bending. When I bend my arm, for example when I move my hand on my shoulder I feel a very high pressure around the elbow, is that normal?
Thanks for your help RFX, would you mind posting a picture of you with a zipped up jacket? I would really like to see how it looks on you, in your WAYWTs you wear your jackets open most of the time. AFAIK you own a "moto jacket" and/or "intarsia", one of those would be perfect