There was a German Roe Deer hunter who used to post about his kills with a Traditions Deer Hunter on the Muzzle Loading Forum a long time ago.
The Roe Deer are quite small, and his set up included a scope and PRB's.
He could shoot really tight groups and always posted photos of his bagged deer.
The only difference from yours was that he loaded with real black powder.
I've always used Pyrodex P and have no complaints.
But even when I belonged to a BP club, the best shooting guns "more often than not" were loaded with black powder.
BP has a different velocity curve that helps many guns shoot PRB's better.
Of course it's also the shooter, but the powder can make a difference.
And I say that even though I'm not a big fan of black powder and its residue.
But I've seen it perform better than anything else.
That's probably not nearly as true if shooting sabots with bullets.