I had that same setup on my old Rhino in a 26" x 14" and I ran between 9-10 PSI. I got a flat one time, and it was a puncture...never found out what did it.
I run 6-7 in the fronts and 8-9 in the rears.
Pretty heavy 4-seat rhino while rock crawling and trail riding.
27" Bighorns on 12" beadlock rims.
Works great.