Info sheet for the Red Rocket says 2-6 psi natural gas or propane and 7-15 psi oxygen. It also recommends 3/8" (or 5/16") hoses.
Regarding 5 psi / 10 psi, that sounds like a good start, but remember if you have flash arrestors, depending on where they are located, that can reduce the available pressure by as much as 1.5 psi.
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