Looks Good from here.
I cant tell where you are measuring the pressure. Is it at the rail?
One quick way to check is remove the # 8 that is feeding the carb. stuff that in a gallon container. Have someone start the engine and measure the amount of seconds it takes to fill it. That will give you a idea of how your setup is pumping. Doing the math no restrictions I get approx 36 seconds.
to fill. In comparison I run Claysmith mechanical with comp electric 140gph
With return regulators The above test produced 12 seconds to fill the gallon container. Keep in mind this test does not have the restriction of the needle and seats. I run twin carbs so I have 4 N/S which is easier to feed the engine. Then a single carburator. Try the above that way you know what you are pumping. What displacement are you running?