Don't take me wrong; I think that having lots of birds at which to shoot is truly great! But I doubt there are any cash prizes or wall plaques for who gets the most birds or who shoots the most ammo. Enjoy the hunting, and don't overestimate the importance of how many shots you take.
That said, I think a padded jacket and normal low-base birdshot loads wouldn't be all that bad on your shoulder.
You're from BATFE? Come right in! I use all your fine products!