[bjgregory]

The point is simple

This is just a method of measuring the accuracy of the current crop of flight models such that people can make an informed decisions based of the presentation

It's a nice idea, but your test itself doesn't really show much considering the many differences between the P-51B and the F-51D. The P-51B *was* faster than any of the D models at the same manifold pressure, as far as I'm aware.
I know it's not your fault that you were forced to use this data, but it still makes your comparison pretty irrelevant.