Just replaced compressor on 10 year old goodman 3ton condenser as well as run capacitor/contacts. Getting 300+ and only 75psi on low side. It has an old filter on the low side. Had to size down the high pressure side of compressor from 1/2 to 3/8 to connect to coils.
Inside coil is not a match to condenser.
System was cooling and sweating the low line prior to the replacement of the above items.
Problem. cooling insuffient to even sweat the low line.
I have my suspicions, but would like input.