We have that same machine at our work for our trucks. All automated. Just hook up, push a few buttons and walk away.

OK, I must need a coffee, because I still don't understand what was done...

I don't totally understand either, because like I said if you equalize them, you are adding, or removing from either low, or high end.
I figured that if it had problems when the ambient temps raised, then there would be refrigerant/oil added, maybe the low end was good, but the high end was too high.

I'll have to try to read the post on what was done again.

X3 confused...
Does the outside or ambient air temperature effect the amount of pressure expected to achieve on the high & low side?
In other words is there a chart or different pressure readings if you were trying to install refrigerant at 95 degrees for instance?

the pressures go up or down based on ambient temp. and the outlet temp and pressures is different based on if its on recirc. i dont see how a machine watching the gauges is better than a experienced human.