Gravel Roubaix tire pressure

[CBRE]

Doing a 72 mile gravel/dirt/road race in June called the Hilly Billy Roubaix, My tire of choice is the Specialized Renegade 29x1.8 on a set of ENVE's, that tire won the race last year. I would say 50% of people are on CX bikes, I used my 1999 CD headshock 26'r last year with Kenda Kosmic lites at 50f, 50r and did ok. Im thinking 45f, 50r for the 29er?