Keep in mind that when listening to an upmixed stereo track, any perceived directionality has a significant chance of being a steering artifact from the upmixing process, rather than actually being an inherent part of the mix itself. This is especially true of older processes such as the first Prologic.

There will also be a significant amount of crosstalk between channels, especially in the surrounds, of things that shouldn't really be there but can't be entirely kept out. Prologic II reduces these kinds of issues, providing a more stable sound field, though it can't eliminate them completely. Only discrete channel mixes accurately represent the true imaging of the source.

If anybody wants to send me the various laserdisc tracks for Raiders, I will compare them to each other and to the DVD and Bluray versions and see what I can find out about their relative dynamics and balance.