I offer my apologies. I meant for that message to be 300EE320.
Even though the system was empty, if you charged it with a death kit it was not evacuated. Without evacuation there is a large amount of moisture that you are introducing the 134 into. This moisture combines with the refrigerant to make an acid that will eventually eat through your evaporator and other components from the inside out.
This is one of the biggest reasons that these are death kits.