Keith,
I agree with Ed in that it sounds like you may have overcharged the system a little unless the system was completely empty. If the system was completely empty, you probably have at leak that will need to be repaired. With charging ports at the compressor, you will have low-side readings a little lower than normal because of the long pull from the front of the coach. Therefore, when charging a system with service ports at the compressor, you should be using a full gauge system to properly evaluate the charge state. A partially restricted expansion valve will also give you a low reading for the low-side.
Gerald