Vintage Air System not too cool????!!!!

Since last night, I've emersed myself with reading as much as I can find on ac. I dont know why VA wants 6-12 on the low side, everything I read says 20-30 is good and 200-250 on the high side is good. I haven't timed the fans nor the compressor and I was on the phone with VA and they said it should have around 45 degree's at the vent and are stumped of at 60 degree reading. My condensor is 24x17, so they said that's fine, condensation on the big is right, but the high side pressure could be lower and that airflow across the condensor is not enough at idle. What does this mean, do I need to put a pusher on the condensor? I'm lost like a fart in a whirlwind.