Some leagues have tanking or inactive teams, meaning free PD when you play them. If the balance of tankers/bots is uneven between the conference, one is given a large inherent advantage.
What if PD were capped at, say, +30 for any given game? If you win by 35, or by 60, you get +30 PD, etc.
I don't know if it's the best idea, but I'm throwing it out there regardless to see what people think.