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All fuel pumps run at maximum pressure/volume all the time, it is the job of the FPR to regulate rail pressure so 53-57 PSI is always maintained at the injector tip under all load conditions.
I have a Walbro 255 in my All Stock VNT and never had an issue with excessive rail pressure or running rich.
(Other than an AFPR that the diaphragm ruptured in about 15 years ago, the AFPR was only 6 month's old, I reinstalled the factory FPR and have had no issues since)

At idle and no load cruise the car is in "Closed Loop Operation" so the O2 Sensor output tells the controller if it is rich/lean so the controller can maintain a 14.7/1 (Stochiometric) A/F Ratio.
During acceleration/WOT the fuel system is operating on a fixed fuel/spark advance program in the controller, the controller has no idea what fuel pressure is or what injectors you may have in the car, it "assumes that both are correct for its programming.
 

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10/1 AF @ WOT is probably normal for a stock vehicle, rich is safe.
 
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