As it has been stated and regurgitated numerous times, an 8 team playoff needs to be implemented, with the P5 champions and the highest ranked G5 team, along with two at large bids. Adding 1 more game to the current process will not or should not cause that much chaos.
Make a few modifications to the rules, such as teams from the same conference, must play each other out, before advancement to next round. I suppose, there could be three teams from the same conference at time, and if that happens, the same rule could apply. IMO