When the compressor was still working, did you measure the high side pressure?
When I refilled my car, i did it with the engine running and the compressor set to max. I filled through the manifold gauge and the pressure would definitely get up to 80 or higher as I filled it, but then would come back down as the system accepted the refrigerant.
2009 G8 GT
1970 Chevelle SS 396
1969 C10 SWB LY6/T56