Refurbing rear 9" drums on my '72 Demon
Don't adjust the shoes until they "barely touch." Adjust them fairly tight, making sure the brake cable is loose, and then BACK THEM OFF equally both sides until they lightly rub.
What are you doing about drums? Old ones turned? New drums? As the old drums wear and are turned, they get LARGER which means the "new" shoes don't fit properly and "hit" only in the middle. Years ago, you had the shoes "arced" on an "arcing machine"
...........One of these horridly awful, dirty machines. Yes, I've been there done that. In a previous life, I've turned literally thousands of drums and rotors, relined (riveted) shoe lining and misc. brake bands