in post 13, it looked to me like he said it was 80 degrees outside, but that the system-off pressure (low and high side) was 95 psi.
the tables from the manuals are helpful, but assume you have run in the shade for five minutes with the windows open, max cool, and high fan.
if there is enough r134a to run the system at low side pressure of 40 psi, there is probably enough to work with.
my experience (limited, I admit) is that low amounts of r134a will result in the low pressure switch turning off the system as the compressor pulls the low pressure down (looks under five or ten but don't quote me), when the switch is off, the pressure rises on the low side, and falls on the high side, till the low pressure switch engages and lets the compressor clutch fire back up, spinning the compressor, and restarting the cycle. this is normal operation when it is cold, but at any condition on the chart, at test conditions which apply, the low pressure switch shoudl not cycle and the compressor should operate continuously.
I would not try too hard to get the pressure readings on the low or high side right into the table ranges. i watched the guy across the street put that extra bit in, and blew his hoses. the noise was scary, the oil provided a nice wash for the engine compartment, and lucky for him, his son the auto service manager made room in the shop and cut him a deal.
the proper way to set r134a load is to evacuate and load by weight. but that assumes no more oil was added. (like you get in a leak check kit, or in cans which include oil and r134a) you can get away with adding r134a if you see it clearly is way low, but you can get into trouble pushing too much in.
if you still have the gauges, can you see what the pressures do while the system cuts in and out?
