AudiDreamr

Replaced my compressor and accumulator and all the other little parts in between a few days ago. Refilled with PAG according to Bentley. Took the car to a garage to have them vacuum it so I could fill it. They did an evacuate AND a vacuum.. When I asked about the compressor oil, they told me the system would have no oil, compressor or r-134a. I added 2 pressurized PAG charges to make up for the supposed absence of oil... and then charged the system with a 18oz. (volume not weight) can of R-134a. My gauge has four measuring zones- from least to greatest, green, blue, yellow, red. Green is low, blue is full, yellow is Warn, and red is Danger. The gause is 5 psi away from the yellow (just below the top of the blue). The air is cool, but not cold, and if I sit still for a minute, it gets downright hot (ambient temp is about 85-100 depending on the time of day).
Before I switched the compressor, I was consistently getting a 22.3 on the cc head, which is a hi-side switch sporadic open. Obviously, I'm going to try switching out the hi-side switch with a spare. If I put in too much PAG, can I just use the compressor drain to pull some of it out, or do I have to evacuate the system and start over? I'd appreciate any additional insight as well. Thanks. BTW, this is the ATW engine, Zexel compressor.