Troubleshooting help needed-AC pressures

Oh boy. I know how you feel. I'm going to have my system (classic auto air) redone. I had a shop charge it, but the tech didn't really seem to want to follow the instructions, and it doesn't blow nearly as cold as it should over 40* on the thermometer.

He only pulled a vacuum for 30 mins (new systems say 90 min).

20-30 minutes after reaching 28-30 inches of vacuum is adequate for almost any system that wasn't at the bottom of a lake.