How did you determine that the refrigerant level is full? The ONLY way to know for sure is to evacuate and recharge by weight. If there is a restriction in the system, the pressures may look right but you will not have enough flow. Thus you cannot go by pressures alone to determine refrigerant fill. If you happened to just check the low-side port (running or not), this tells you absolutely nothing.

If the low-side and high-side pressures are within specifications and the system is performing as designed, you probably have the system full (or nearly so). If the pressures are within specifications but you do not have good performance, there is a problem other than refrigerant level.