This from your last post GTX MATT...

"I'm looking at it from the standpoint of the valve is closed, there's some # of boost in the intake manifold behind the valve, now the valve opens and its going to fill the cylinder in less time that at 0 PSI."

Hard to argue if that's where it ends. But that's not where it ends. What is the pressure on the other side of the intake valve when under boost?
The cylinder has only two points of reference, the intake charge, and the exhaust. As boost increases, so does exhaust pressure. It doesn't matter if it's supercharged or turbocharged... exhaust pressure gets very high under boost. So at best, cylinder fill starts to happen (loosely)at around a 1:1 pressure ratio.