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im not sure n the actual numbers but the fuel presume regulator obtains vacuum from the manifold.
the manifold vacuum will be higher or lower under certain conditions so it may be designed to be slightly variable.
when you are hard down on the gas, one may think well its sucking hard then so it has higher vacuum..
now that assumption may be actually quite untrue, I'm thinking back to an old international scout truck I had with a vacuum driven wiper that was a little worn and stubborn, sometimes it would stop wiping.
sometimes I'd have to let up on the gas to allow the windows to wipe better.. so I think it actually has more vacuum when the engine is slowing the vehicle with the throttle closed. its trying to suck air, but the throttle is not open so there is a higher vacuum level..
how the vacuum reacts may be slightly different than you first imagine. someone else can explain that better..
the way the engine increases the fuel rate is by increasing the open time ( dwell time) of the fuel injectors. I do believe you will see some fluctuations in fuel pressure and that may be normal.
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