When cruising on the highway, I see 45F max on the left-side center vent. When idling, I see about 41F. This is lately, with 95F+ ambient temperatures, and the fan set to three bars.

However, whenever I leave idle and accelerate onto the highway, the left vent rises in temperature and humidity; water condenses on my thermometer. I don't have a thermometer in the right vent, but it feels much colder than the left when this occurs. After about a minute, the condensation evaporates and the thermometer starts lowering. After a few minutes, it settles in to a nice chill.

Has anyone seen these symptoms?

I suspect that I'm a bit low on refridgerant, since the system only gets to about 16 bar on 100F days, and the auxiliary fan is starting (there's a very short delay after the 14 bar criterium is met before the fan starts), which promptly lowers the pressure to below 14. Often below 11, shutting down the fan again (unless the ECT exceeds 95C, of course).

Yes, I drive while the climate-control computer is in current-sensor readout mode, watching number 7. Pretty much all the time.