Man I feel for you.... Here you try to do everything right and old MURPHY rears his ugly head.
I would try to take your BEST educated guess and add the amount of oil you think you lost. I think you wouldn't go wrong to add 2oz.of oil. Too much oil and the efficency goes down, too little and you risk the compressor. I would also recharge the system to specs as far as the amount of R134. Running the system low on refrigerant works the compressor harder. Buy a new set of hoses for your A/C gauge manafold.
I NEVER mind trying to help guys when they ask for help on their other wheels. Good luck. Chris

__________________
My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.