Also, I am not sure that I am getting the
>correct heat transfer across the evaporator coil.  I have found ice on one
>of the lines from the compressor even with a hot engine compartment, so I
>know that things are working well on that end.

        Sounds like the refrigerant is not flowing as well as it could/should.
May have to flush and evacuate and new drier again, or expansion valve.
Someone who is an a/c expert on the list should be able to diagnose.  I am
not he.

HK