A team like Cincy would make the 12 team playoff so that is a silly argument. The teams you are advocating for aren't even Top 40 teams. Also after the next round of expansion it gets worse as the good G5 are becoming P5.
A team like 8 seed Penn State has zero chance of winning at UGA. You want to have Ohio play at UGA why? The backups will be in for the 2nd Q. And yes Ohio playing at SU would be a game we should win 99% of the time.
How do you fit 8 playoff games into a weekend? You do not want games starting at the same time. The best you can do is...
Friday 7:15 and 9:00
Saturday 12:15, 2:00, 3:45, 5:30, 7:15, 9:00
That way when the earlier game is starting the 3rd Q, the later is starting its game. FCS doesn't have that issue because no one watches those games. There isn't big TV money. NFL doesn't have that issue as they have 3 games Saturday and 3 games Sunday with no overlap.