Ah...

Well, after throwing some money at it, Boyle's gas law is back in effect in my pedestrian daily ride. Unlike the Federal Government, throwing money at this problem actually worked!

Here is ambient temp at stately manor.

Here is discharge temp on the A/C vent after 8 minutes of operation:

The funny thing about all of this is that the '94 FoMoCo shop manual and the '71 shop manual have the EXACT same text on the theory of operation. It seems that someone has been using cut and paste for a very long time!