This
Pressure is restriction to flow, the Pump creates the flow, the regulator restricts the flow on the exit of the fuel rail.
It is possible your gauge is out as above or the FPR is a bit dodgy. But it isn't really that big a deal. I know its not the cheapest option but you can just go and get it retuned (It looks like you have a Power FC) and the car will run fine.
Having said that, if you drop the base pressure, you'll have to get a re-tune anyway as the fuel pressure under load will be a tad lower and thats a bit more dangerous then it being a bit rich
I'd just take it for a retune, I dont think your Dangerously above the standard base pressure but if your that worried about it, replace the FPR (Maybe borrow a stock FPR if you know someone) and see if that fixes it and get a re-tune then