Fuel pressure for oxy-propane

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Is there a maximum pressure for fuel in an oxy-propane torch setup?At work I use two torches, simultaneously  with large rosebuds ( Harris 2290-5h, almost 1 million btu each). Fuel and oxygen regulators are teed to the two torches.Other employees have apparently kept it at 15psi (max pressure for acetylene )I’m wondering if higher fuel pressure could safely provide more flow for those big rosebuds. Not sure if those big tips should really be teed off of regulators. Torches are operated with fuel valve wide open. Oxygen flow doesn’t seem to be a problem.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite