For everyone's convenience, I've included a text file (Primacy Fix.txt) with a listing of corrections that can be made to player's Primacy that should ensure the right people lead their teams in scoring even after all the Primacy ratings are recalculated by the game after editing a player, creating a player or an injury occurs in Dynasty Mode. You can also find that document
here.
I've found that editing these key players while allowing the game to determine the rest of the Primacy ratings yields good results (most of the time - the game's stats engine is of course still sketchy). I'll be adding to the list as I continue my work with the Primacy ratings.