I've done A/C work for a long time. The general rule of thumb I've always heard is if you get 20* less than the ambient temperature blowing outta the vents, you're good to go. I would say you're deal is coolin it's *** off.
Not tryin' to start anything, but your 2 statements contradict each other. My original post in this thread said I needed a low 40's reading from a thermometer in the vent..........