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The vacuum it sees is created by the velocity of the air passing over the venturi.
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that as soon as boost is created, the velocity of the inlet air will increase alot, causing the piston to rise too much and run too rich.
I think a stiffer spring or a variable rate spring would take care of this.
As far as running a hose to pressurize the domes, wouldn't the domes get pressure from the same holes that cause the piston to lift? With everything pressurized, wouldn't the flow of air in the venturi still cause a decrease in pressure in the dome and let the piston rise? The air flow won't create a vaccum but if the pressure above the piston is less than the pressure under it, it should rise.
I, too, am typing as I think. And I think I just confused myself.
edit- I thought about this some more. What I'm saying is I think the air flow should create a difference in pressure to lift the piston of a pressurized SU just as airflow draws fuel in a pressurized 32/36.
I don't think you would have to pressurize the piston dome like you would a float bowl, though, because the piston dome is sealed. The pressure acting on the top of the piston, from those holes in the venturi, should be the same and cancel out the pressure acting on the bottom of the piston in the venturi.
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