You also get higher airflow through the vents on Max.

Are you setting it to Max AC?
If I don't use the Max AC and it is drawing in outside air it's just going be 20-25 degrees below the outside air temp.

My readings were on high 80, low 90 degree days, unknown humidity levels. But Memphis has pretty high humidity.

I replaced the entire system in my 88 BII last year. It was my first attempt at doing AC work other than a top off on a charge. The compressor belt had been off for as long as the previous owner had it, so at least 5 years. I vacuumed it down and charged it to test and the compressor knocked really ...