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you should have the fuel suction checked, these trucks have a set of small screen in the fuel pickup, they become clogged over time and restrict the fuel flow. One way to check this is to remove the fuel suction line from the inframe pump, then remove the fuel filler cap and gently blow back through the suction line into the tank, this clears the filters enough to road test and notice a difference, if there is an improvement then you need to remove the tank and clean out or replace the filters.
The pressure in theory should fall low but doesn't seem to. The fuel tanks are galvanized tin, but will rust and the rust particles will plug the screens also if you use a biofuel which has ethanol in it the ethanol will eat the galvanized coat off the inside of the tank.
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How many miles are on the engine?
You may have a partially plugged exhaust, I check this by undoing the connection at the end of the down pipe and then taking it for a drive, you could also check the exhaust back pressure on the EBP reading with a scan tool, the reading should never go above 35 to 36 psi with the truck in park and the engine revved up to governed speed.
Yes that is correct.