Today I noticed one of the large positive terminals in my LH rear
pillar had obviously been overheated. The mounting screw was slightly
loose. So I replaced the terminal, cleaned everything up on both
connectors, cleaned the grounds and tightened all the connections.

These two terminals and the 50 amp fuse link still run really hot.
Anyone checked these (with a/c running obviously)?  Is this the norm
or do I have another problem?

How much current is flowing here normally?

I ran the A/C for about 1/2 hour after repairing the wiring, with no
problem other than hot supply wires.

Here's a photo of my overheated terminal before replacement -

http://bworks.net/vw/acwiring.htm

Angus