What hits more in college football correlated parlays D/U or F/O

What hits more in college football correlated parlays D/U or F/O?

I am asking because this will help in my capping of these games.  I can use this info to see if I am on the strongest side of a correlated play. 

Example:  If I knew Dogs and Unders hit more in correlated plays than Favorites and Overs, and in my capping of correlated games I find 2 dogs I like, then I would feel strongly about parlaying the 2 dogs. 

I think this might be worth a try since books do not take correlated parlays.

So if someone has the numbers on what hits more, this would be really helpful and appreciated!

dish, over four years of data that I have the F/O just slightly comes in more. So slightly I'm not sure it's statistically significant. This year for the first 4 weeks it has come in a lot more. 29-19 for the 1st halves and 19-10 for full games. I don't know if this trend will continue or if it will revert back to the mean as the season progresses.