Right now all the top players go to those top teams (Alabama, Clemson, Ohio State, Oklahoma). It makes sense because those same teams are in the playoff year after year so all the good players want to go there. And all the 5 star kids going there leads to more playoffs. And the reputation that those teams "belong" in the playoff and are always the best would get them there even if they borderline don't deserve it. They will always get the benefit of the doubt.
So change 2 things:
1. Fix recruiting. Limit the number of 5 star and 4 star players a school can recruit. That will spread out the talent.
2. Expand the playoff. By expanding the playoff, more teams will get a chance and more recruits will choose other schools because they will have more access.