looking for what everyone is running their silverbacks at ?

My dad keeps on popping beads on the 800 with 7 psi, I’ve never had a problem with running 7 psi but I also drive aggressive, he on the other hand is methodical and likes to roll into stuff. have searched for a couple days and have found that a lot of people run 4-5 psi or are on the other end of the spectrum and run 15+

We ride a lot of clay mud and rarly see more then 40 km/h on the trail