Really small units are really really difficult to charge by gauges Schock, just the hoses hold almost the same amount as the unit LOL Think it's an ounce per ft, if i remember right
My own home side by side called for I think it was 6 ozs of 134 when we replaced the compressor, after weighing in the right amount; I said "eh, it's not, right add some more"
it's great except when the ac is off in the house and the kitchen gets really warm from summer heat and the head pressure climbs, and the inside temp struggles with ice cream
Point is, with 134 and refrigeration systems like these. They will get cold/freeze.. until later. much later. It takes quite some time for the pressures to stabilize when the little compressor is running if it's over charged. the discharge pressure will rise.. slow, very slowly. But yes, Schock, we all do it
R-12 and other CFC freons still react faster then compounds like 134. I don't like it.. but it's here to stay
I still run R-12 in my old car it's great. It's weird sitting in a newer car or truck and waiting for the 134 to start cooling