separation of bubble teams is highly imperfect. we can't forget that most of the committee watch a lot of game sat the end of the season, and that experience forms a lot of their "tie breaking" methods when it comes to picking between two otherwise deserving teams.
That's not going to change, quadrant scheme or no quadrant scheme (which, incidentally, I think will last for all of a whopping one season. It'll be gone for next year).